{"investigation":{"slug":"taiko-bridge-sgx-key-exploit-june-2026","entity_name":"Taiko Bridge SGX Key Exploit (June 2026)","trust_score":26,"severity_base":null,"score_modifier":-8,"confidence":0.84,"status":"published","content_type":"investigation","summary":"On June 21-22, 2026, Taiko's Ethereum L1 Bridge and ERC20Vault were drained of approximately $1.7 million after an RSA-3072 Intel SGX enclave signing key for the Raiko prover stack was committed to the public taikoxyz/raiko GitHub repository. The attacker used the key to register rogue SGX prover instances and forge cross-chain withdrawal proofs with no matching deposits on Taiko L2. Taiko froze the bridge and halted block production within minutes of detection, recollateralized the bridge 1:1, made affected users whole, and reopened the bridge on July 2, 2026 after an independent security review.","sections":[{"content":"Taiko, an Ethereum-equivalent (Type-1) ZK rollup operated by Taiko Labs under the name Taiko Alethia, confirmed on June 22, 2026 that its L1 Bridge contract (0xd60247c6848B7Ca29eDdF63AA924E53dB6Ddd8EC) and ERC20Vault contract (0x996282cA11E5DEb6B5D122CC3B9A1FcAAD4415Ab) on Ethereum mainnet had been exploited for approximately $1.7 million. The attack was made possible by an operational security failure: an RSA-3072 private key file, enclave-key.pem, used to authenticate Intel SGX enclave computations for Taiko's Raiko multi-prover stack, had been committed to the public taikoxyz/raiko GitHub repository. With this key the attacker registered their own hardware as a trusted SGX prover and generated fraudulent withdrawal proofs that the on-chain verifier accepted, releasing assets from L1 custody without corresponding deposits on the Taiko chain. Sources differ on the start date: DARKNAVY's technical analysis and crypto.news place the start of the attack sequence on June 21, 2026, while most reporting dates the exploit to June 22. Taiko halted block production network-wide, froze the affected contracts and urged users to exit every bridge on the network. The $1.7 million loss equalled roughly 11.7% of TAIKO's market capitalization of about $14.5 million at the time.","heading":"Incident Overview","sources":[{"url":"https://www.coindesk.com/tech/2026/06/22/taiko-halts-its-ethereum-layer-2-network-after-a-bridge-exploit-token-dives-10","name":"Taiko halts its Ethereum layer-2 network after a bridge exploit, token dives - CoinDesk","type":"news_article","credibility":1},{"url":"https://www.cryptotimes.io/2026/06/22/1-7m-gone-taiko-bridge-exploited-after-sgx-signing-key-leak/","name":"$1.7M Gone: Taiko Bridge Exploited After SGX Signing Key Leak - CryptoTimes","type":"news_article","credibility":2},{"url":"https://www.darknavy.org/web3/exploits/taiko-bridge-source-signal-proof-forgery/","name":"Taiko Bridge Source-Signal Proof Forgery - DARKNAVY Blog","type":"research","credibility":2},{"url":"https://www.theblock.co/post/405486/taiko-confirms-exploit","name":"Ethereum Layer 2 Taiko halts block production following exploit - The Block","type":"news_article","credibility":1},{"url":"https://www.banklesstimes.com/articles/2026/06/22/taiko-halts-blocks-after-1-7m-exploit-urges-users-to-exit-bridges/","name":"Taiko Halts Blocks After $1.7M Exploit, Urges Users to Exit Bridges - BanklessTimes","type":"news_article","credibility":2},{"url":"https://coincodex.com/article/86299/ethereum-layer-2-taiko-halts-network-after-17m-exploit-token-falls-11/","name":"Ethereum Layer 2 Taiko Halts Network After $1.7M Exploit, Token Falls 11% - CoinCodex","type":"news_article","credibility":2},{"url":"https://decrypt.co/371769/ethereum-layer-2-taiko-warns-153103509.html","name":"Ethereum Layer-2 Taiko Warns Users to Withdraw Bridge Funds After Security Breach - Decrypt","type":"news_article","credibility":1},{"url":"https://crypto.news/taiko-sets-four-step-restart-plan-after-june-21-bridge-attack/","name":"Taiko sets four-step restart plan after June 21 bridge attack - crypto.news","type":"news_article","credibility":2}],"severity":"critical"},{"content":"Taiko is an Ethereum-equivalent ZK-rollup Layer-2 network co-founded by Daniel Wang, former CEO of Loopring, and launched its mainnet in May 2024. It uses a multi-prover model, with its Raiko stack supporting Intel SGX-based proof generation as one of several proof mechanisms. Its bridge relies on cross-chain message passing in which SGX attestations act as trust anchors for withdrawal authorization. At the time of the exploit TAIKO was a smaller-cap L2 with a market capitalization of about $14.5 million. No prior major security incidents had been reported for Taiko before June 2026.","heading":"Background: Taiko Protocol","sources":[{"url":"https://decrypt.co/371769/ethereum-layer-2-taiko-warns-153103509.html","name":"Ethereum Layer-2 Taiko Warns Users to Withdraw Bridge Funds After Security Breach - Decrypt","type":"news_article","credibility":1},{"url":"https://bitcoinfoundation.org/news/blockchain-news/ethereum-l2-taiko-hack-forces-bridge-warning-amid-1-7m-exploit/","name":"Taiko Hack Forces Bridge Withdrawal Warning Amid $1.7M Incident - Bitcoin Foundation News","type":"news_article","credibility":2}],"severity":"low"},{"content":"Raiko uses Intel SGX enclaves (Trusted Execution Environments) to generate cryptographic attestations of L2 state transitions that Taiko's L1 bridge contracts accept as proof of validity. The MrSigner value stored in Taiko's on-chain verifier is derived from the RSA-3072 public key corresponding to the enclave signing key, and any enclave signed with the matching private key is treated as a trusted prover. Under the intended design the key stays sealed inside tamper-resistant hardware so that only authorized participants can generate proofs. Instead, enclave-key.pem was allegedly committed in plaintext to the public taikoxyz/raiko repository, where anyone with a GitHub account could read it. Because the verifier derived trust solely from the MrSigner attestation with no additional controls, possessing the key was enough to register an attacker-controlled enclave as a fully trusted prover. The SGX attestation mechanism worked as designed but validated the wrong operator, making this a trust-model and key-management failure rather than a code flaw in SGX or Raiko. BlockSec (via its Phalcon monitoring platform) and Quill Audits independently identified the exposed key as the root cause, and the Ledger CTO and other researchers publicly characterized the incident as an operational key-management error.","heading":"Root Cause: SGX Signing Key Exposed on GitHub","sources":[{"url":"https://blog.thirdweb.com/taiko-bridge-exploit-explained-how-a-leaked-key-led-to-1-7m-in-forged-withdrawals/","name":"Taiko Bridge Exploit: How a Leaked Key Drained $1.7M from an Ethereum L2 - thirdweb Blog","type":"research","credibility":2},{"url":"https://thedefiant.io/news/hacks/taiko-bridge-exploit-sgx-signing-key-github-1-7m","name":"Taiko Bridge Drained $1.7M After SGX Signing Key Left Exposed on GitHub - The Defiant","type":"news_article","credibility":2},{"url":"https://www.darknavy.org/web3/exploits/taiko-bridge-source-signal-proof-forgery/","name":"Taiko Bridge Source-Signal Proof Forgery - DARKNAVY Blog","type":"research","credibility":2},{"url":"https://www.cryptotimes.io/2026/06/22/1-7m-gone-taiko-bridge-exploited-after-sgx-signing-key-leak/","name":"$1.7M Gone: Taiko Bridge Exploited After SGX Signing Key Leak - CryptoTimes","type":"news_article","credibility":2},{"url":"https://incrypted.com/en/ledger-cto-private-key-leak-caused-taiko-hack/","name":"Ledger CTO: Private Key Leak Caused the Taiko Hack - Incrypted","type":"news_article","credibility":2},{"url":"https://github.com/taikoxyz/raiko","name":"GitHub - taikoxyz/raiko (public repository containing the Raiko multi-prover stack)","type":"official","credibility":1},{"url":"https://www.spotedcrypto.com/taiko-bridge-exploit-june-2026/","name":"Taiko Bridge Exploit June 2026: $1.7M SGX Key Leak Explained - SpotedCrypto","type":"news_article","credibility":3},{"url":"https://www.techtimes.com/articles/318886/20260623/ethereum-l2-bridge-exploit-drains-17m-leaked-sgx-key-defeats-taiko-trust-model.htm","name":"Ethereum L2 Bridge Exploit Drains $1.7M: Leaked SGX Key Defeats Taiko Trust Model - TechTimes","type":"news_article","credibility":2}],"severity":"critical"},{"content":"DARKNAVY's technical analysis describes a four-phase sequence beginning on June 21, 2026; other outlets summarise it as two stages (rogue prover registration, then forged withdrawals). (1) The attacker's primary wallet, 0x7506DeA0c38ca0B55364B22424374c5A1ae1B76a, registered two malicious SGX verifier instances (IDs 5 and 6) in one transaction (0x2f44dc1b883522a88f9b0cbbdfabf9ec33884b69dd4326600c3fab7fb2277260). A compounding configuration flaw, INSTANCE_VALIDITY_DELAY set to zero, let freshly registered instances authorize high-value withdrawals immediately, removing any finality window that might have caught the fraud. (2) The attacker submitted a malicious checkpoint for Taiko block 1805600 with an attacker-controlled state root (0x5064e2a3dfde1cd6d164e07b5dae47433d20a2d2c1ba6c9bda60c1ab6765215f). (3) The attacker called Bridge.processMessage() ten times with forged message hashes, setting them to RETRIABLE; no corresponding MessageSent events existed on the Taiko chain, meaning no deposits had been made on L2. (4) Follow-up retryMessage() calls, which executed with minimal additional validation, released tokens from the ERC20Vault and ETH from the Bridge.\n\nStructurally, SignalService.proveSignalReceived() accepted Merkle proofs against any saved checkpoint without independently verifying that a legitimate MessageSent event had been emitted on the source chain, and the bridge had no mechanism to confirm L2 deposits before releasing L1 funds. The vulnerable contracts were the Bridge (0xd60247c6848B7Ca29eDdF63AA924E53dB6Ddd8EC), SignalService (0x9e0a2496...) and ERC20Vault (0x996282cA11E5DEb6B5D122CC3B9A1FcAAD4415Ab). One input page noted that the Bridge and ERC20Vault addresses were reported by CryptoTimes and had not yet been confirmed in an official Taiko post-mortem. Three further attacker-linked wallets were disclosed: 0x5fbc60a12bc6635e7d587d8dac52e4b1388b4990, 0x3cc936b795a188f0e246cbb2d74c5bd190aecf18 and 0x9108828e30f2de407aadb0af677b4a9228e4acd4.","heading":"Attack Mechanism and On-Chain Execution","sources":[{"url":"https://www.darknavy.org/web3/exploits/taiko-bridge-source-signal-proof-forgery/","name":"Taiko Bridge Source-Signal Proof Forgery - DARKNAVY Blog","type":"research","credibility":2},{"url":"https://www.spotedcrypto.com/taiko-bridge-exploit-june-2026/","name":"Taiko Bridge Exploit June 2026: $1.7M SGX Key Leak Explained - SpotedCrypto","type":"news_article","credibility":3},{"url":"https://blog.thirdweb.com/taiko-bridge-exploit-explained-how-a-leaked-key-led-to-1-7m-in-forged-withdrawals/","name":"Taiko Bridge Exploit: How a Leaked Key Drained $1.7M from an Ethereum L2 - thirdweb Blog","type":"research","credibility":2},{"url":"https://www.cryptotimes.io/2026/06/22/1-7m-gone-taiko-bridge-exploited-after-sgx-signing-key-leak/","name":"$1.7M Gone: Taiko Bridge Exploited After SGX Signing Key Leak - CryptoTimes","type":"news_article","credibility":2},{"url":"https://www.techtimes.com/articles/318886/20260623/ethereum-l2-bridge-exploit-drains-17m-leaked-sgx-key-defeats-taiko-trust-model.htm","name":"Ethereum L2 Bridge Exploit Drains $1.7M: Leaked SGX Key Defeats Taiko Trust Model - TechTimes","type":"news_article","credibility":2}],"severity":"critical"},{"content":"DARKNAVY catalogued the assets drained from the L1 Bridge and ERC20Vault as 675,761.24 USDC, 138,139.56 USDT, 156,832.01 crvUSD and 150.70 ETH/WETH, plus smaller amounts of WBTC, weETH, CRV, iZi and TAIKO, totalling about $1.7 million. Another input page describes the haul as roughly 870 ETH (about $1.52 million) and 1.99 million TAIKO; Lookonchain on-chain tracking, as reported, found about 870.8 ETH (nearly $1.52 million) remaining in the attacker's primary wallet at initial reporting. Before the freeze the attacker moved TAIKO tokens to the MEXC exchange. Reports differ on the size of that transfer: 1.99 million TAIKO worth about $189,000 (Lookonchain via CoinDesk and CryptoTimes), or about 2 million TAIKO worth about $170,000 (thirdweb and others). Recovery of those tokens had not been publicly confirmed.","heading":"Assets Drained and Fund Movement","sources":[{"url":"https://www.darknavy.org/web3/exploits/taiko-bridge-source-signal-proof-forgery/","name":"Taiko Bridge Source-Signal Proof Forgery - DARKNAVY Blog","type":"on_chain","credibility":2},{"url":"https://www.coindesk.com/tech/2026/06/22/taiko-halts-its-ethereum-layer-2-network-after-a-bridge-exploit-token-dives-10","name":"Taiko halts its Ethereum layer-2 network after a bridge exploit, token dives - CoinDesk","type":"news_article","credibility":1},{"url":"https://www.mexc.com/news/1163847","name":"Taiko urges users to exit bridges after a verification flaw - MEXC News","type":"news_article","credibility":2},{"url":"https://www.cryptotimes.io/2026/06/22/1-7m-gone-taiko-bridge-exploited-after-sgx-signing-key-leak/","name":"$1.7M Gone: Taiko Bridge Exploited After SGX Signing Key Leak - CryptoTimes","type":"news_article","credibility":2},{"url":"https://blog.thirdweb.com/taiko-bridge-exploit-explained-how-a-leaked-key-led-to-1-7m-in-forged-withdrawals/","name":"Taiko Bridge Exploit: How a Leaked Key Drained $1.7M from an Ethereum L2 - thirdweb Blog","type":"research","credibility":2}],"severity":"high"},{"content":"Blockaid's automated monitoring detected the attack in real time, and the activity was detected and frozen between about 2:00 a.m. and 2:08 a.m. ET on June 22, 2026, a window of roughly eight minutes. Taiko's Security Council multisig paused the Bridge and ERC20Vault, halting withdrawals, and all proposers were told to stop producing blocks while containment was coordinated with ecosystem partners. Taiko urged users to withdraw remaining funds from every bridge on the network, asked centralized exchanges to suspend TAIKO deposits to limit the attacker's liquidity, published the attacker's known wallet addresses, and committed to publishing a full post-mortem. South Korean exchanges Upbit and Bithumb suspended TAIKO deposits and withdrawals, citing a network issue. Taiko warned users against unsolicited messages and fake recovery sites ('We'll never DM you first, and there's no claim or refund site'). Taiko Labs said it was working with exchanges and security partners to track and freeze attacker assets and would pursue technical and legal action, and Taiko's CEO filed a formal report with Singapore authorities. The team confirmed the exploit was fully contained the same day. BlockSec's Phalcon arm and Quill Audits also flagged the exploit and published analysis. Commentators noted that damage was limited mainly by rapid third-party detection and manual intervention, not by any on-chain circuit breaker active at the time.","heading":"Detection, Containment and Immediate Response","sources":[{"url":"https://www.coindesk.com/tech/2026/06/22/taiko-halts-its-ethereum-layer-2-network-after-a-bridge-exploit-token-dives-10","name":"Taiko halts its Ethereum layer-2 network after a bridge exploit, token dives - CoinDesk","type":"news_article","credibility":1},{"url":"https://beincrypto.com/taiko-bridge-exploit-june-crypto-hacks/","name":"Taiko Exploit Adds to June Tally of Over 20 Crypto Hacks - BeInCrypto","type":"news_article","credibility":2},{"url":"https://www.cryptotimes.io/2026/06/22/1-7m-gone-taiko-bridge-exploited-after-sgx-signing-key-leak/","name":"$1.7M Gone: Taiko Bridge Exploited After SGX Signing Key Leak - CryptoTimes","type":"news_article","credibility":2},{"url":"https://www.spotedcrypto.com/taiko-bridge-exploit-june-2026/","name":"Taiko Bridge Exploit June 2026: $1.7M SGX Key Leak Explained - SpotedCrypto","type":"news_article","credibility":3},{"url":"https://mpost.io/taiko-loses-1-7m-in-bridge-exploit-suspends-block-production-and-freezes-withdrawals/","name":"Taiko Loses $1.7M In Bridge Exploit, Suspends Block Production And Freezes Withdrawals - Metaverse Post","type":"news_article","credibility":2},{"url":"https://www.banklesstimes.com/articles/2026/06/22/taiko-halts-blocks-after-1-7m-exploit-urges-users-to-exit-bridges/","name":"Taiko Halts Blocks After $1.7M Exploit, Urges Users to Exit Bridges - BanklessTimes","type":"news_article","credibility":2},{"url":"https://www.cryptotimes.io/2026/06/25/taiko-to-fully-restore-bridge-backing-after-1-7m-hack/","name":"Taiko to Fully Restore Bridge Backing After $1.7M Hack - CryptoTimes","type":"news_article","credibility":2},{"url":"https://decrypt.co/371769/ethereum-layer-2-taiko-warns-153103509.html","name":"Ethereum Layer-2 Taiko Warns Users to Withdraw Bridge Funds After Security Breach - Decrypt","type":"news_article","credibility":1},{"url":"https://www.mexc.com/news/1162981","name":"Upbit Halts TAIKO Deposits and Withdrawals Amid Network Issue - MEXC","type":"official","credibility":2},{"url":"https://www.mexc.com/news/1162980","name":"Bithumb Temporarily Halts TAIKO Deposits and Withdrawals Due to Mainnet Issue - MEXC","type":"official","credibility":2},{"url":"https://x.com/taikoxyz/status/2068953220097986953","name":"Taiko official X: Incident update - bridge and ERC20Vault paused","type":"social_media","credibility":2},{"url":"https://www.techtimes.com/articles/318886/20260623/ethereum-l2-bridge-exploit-drains-17m-leaked-sgx-key-defeats-taiko-trust-model.htm","name":"Ethereum L2 Bridge Exploit Drains $1.7M: Leaked SGX Key Defeats Taiko Trust Model - TechTimes","type":"news_article","credibility":2}],"severity":"high"},{"content":"At 17:09 UTC on June 22, 2026, Taiko developers opened recovery pull request #21820 ('feat(protocol): port hack recovery hooks to v3') against the v3.0.0 protocol branch of taikoxyz/taiko-mono. The PR comprises 7 commits and 15 changed files (485 additions, 269 deletions) and bundles four fixes: (1) checkpoint versioning with immutable version namespacing, which invalidates all stored checkpoints and forces re-derivation from a clean state; (2) an Inbox state reset via a one-time Inbox.init2() call, restoring core chain state to a point before the attack; (3) bridge-message invalidation, voiding the fraudulent messages (described by crypto.news as marking three attacker message hashes DONE); and (4) restoration of QuotaManager per-window transfer limits, reported at about $200,000 per 15-minute window. Early reports noted that the PR was then still unmerged pending Security Council sign-off.\n\nOn June 25, 2026, Taiko said that 'no user will lose funds because of this incident' and that the bridge would be fully recollateralized 1:1 before reopening. Taiko then published a four-step restart plan: deploy PR #21820 and confirm a finalized state with no forged checkpoints or attacker claims reachable; recollateralize the bridge 1:1, verifiable on-chain; restore L2 transfers, swaps and trading under monitoring; and reopen the bridge after a post-fix audit and Security Council multisig approval. Sources differ on when the plan was published: June 29 according to CryptoBriefing and around June 28 according to crypto.news. Taiko patched the proof-verification flaw, revoked the compromised key's authority, replenished reserves to full 1:1 backing and completed an independent security review; the reviewing firm was not publicly named. The bridge reopened on July 2, 2026, ten days after the exploit, under conservative withdrawal quotas, with the Security Council authorizing the final unpause. The team confirmed all affected users were made whole. A post-mortem had been pledged but had not been published as of the input research.","heading":"Recovery, Patch and Bridge Reopening","sources":[{"url":"https://www.spotedcrypto.com/taiko-bridge-exploit-june-2026/","name":"Taiko Bridge Exploit June 2026: $1.7M SGX Key Leak Explained - SpotedCrypto","type":"news_article","credibility":3},{"url":"https://www.cryptowisser.com/news/taiko-rollup-confirms-bridge-exploit-after-chain-state-verification-compromise","name":"Taiko Rollup Confirms Bridge Exploit After Chain State Verification Compromise - CryptoWisser","type":"news_article","credibility":2},{"url":"https://cryptodaily.co.uk/2026/06/taiko-bridge-exploit-l2-withdrawal-ux-defi-safety-test","name":"Taiko Bridge Exploit: Why L2 Withdrawal UX Is Becoming a DeFi Safety Test - CryptoDaily","type":"news_article","credibility":2},{"url":"https://www.cryptotimes.io/2026/06/25/taiko-to-fully-restore-bridge-backing-after-1-7m-hack/","name":"Taiko to Fully Restore Bridge Backing After $1.7M Hack - CryptoTimes","type":"news_article","credibility":2},{"url":"https://crypto.news/taiko-sets-four-step-restart-plan-after-june-21-bridge-attack/","name":"Taiko sets four-step restart plan after June 21 bridge attack - crypto.news","type":"news_article","credibility":2},{"url":"https://cryptonews.net/news/security/33075428/","name":"Taiko sets four-step restart plan after June 21 bridge attack - cryptonews.net","type":"news_article","credibility":2},{"url":"https://www.coindesk.com/markets/2026/07/02/taiko-s-bridge-is-back-online-after-usd1-7-million-hack-and-its-token-is-up-a-staggering-136","name":"Taiko fully restores cross-chain bridge just 10 days after a $1.7 million hack - CoinDesk","type":"news_article","credibility":1},{"url":"https://cryptobriefing.com/taiko-reopens-bridge-after-exploit-recovery/","name":"Taiko reopens bridge after recovering from $1.7M exploit last month - CryptoBriefing","type":"news_article","credibility":2}],"severity":"medium"},{"content":"TAIKO fell sharply after the disclosure on June 22, 2026, briefly reaching an all-time low of about $0.07294. The size of the fall varies by source and measurement window: CoinDesk reported a slump of more than 20% since midnight UTC, CoinCodex and CoinMarketCap about 11%, and AMBCrypto 10%. Exchange-level suspensions at Upbit, Bithumb and other venues reduced liquidity and market-maker activity, adding to the pressure. With a market capitalization of about $14.5 million, the $1.7 million loss equalled roughly 11.7% of market cap, an outsized impact compared with larger protocols. After the bridge reopened on July 2, 2026, TAIKO rose as much as 136%, partly on relief at the quick resolution and full user restitution.","heading":"Token and Market Impact","sources":[{"url":"https://www.coindesk.com/tech/2026/06/22/taiko-halts-its-ethereum-layer-2-network-after-a-bridge-exploit-token-dives-10","name":"Taiko halts its Ethereum layer-2 network after a bridge exploit, token dives - CoinDesk","type":"news_article","credibility":1},{"url":"https://coincodex.com/article/86299/ethereum-layer-2-taiko-halts-network-after-17m-exploit-token-falls-11/","name":"Ethereum Layer 2 Taiko Halts Network After $1.7M Exploit, Token Falls 11% - CoinCodex","type":"news_article","credibility":2},{"url":"https://coinmarketcap.com/academy/article/taiko-urges-bridge-exit-after-hackers-drain-dollar17m","name":"Taiko Urges Bridge Exit After Hackers Drain $1.7M - CoinMarketCap","type":"news_article","credibility":2},{"url":"https://ambcrypto.com/taiko-token-crashes-10-following-1-7mln-exploit-details/","name":"Taiko token crashes 10% following $1.7mln exploit - AMBCrypto","type":"news_article","credibility":2},{"url":"https://invezz.com/news/2026/06/22/taiko-hits-all-time-low-as-taiko-bridge-exploit-drains-1-7m/","name":"TAIKO hits all-time low as Taiko bridge exploit drains $1.7M - Invezz","type":"news_article","credibility":2},{"url":"https://www.tradingview.com/news/cointelegraph:8a1c1fe03094b:0-taiko-urges-users-to-withdraw-as-bridge-exploit-drains-1-7m/","name":"Taiko urges users to withdraw as bridge exploit drains $1.7M - CoinTelegraph via TradingView","type":"news_article","credibility":2},{"url":"https://www.coindesk.com/markets/2026/07/02/taiko-s-bridge-is-back-online-after-usd1-7-million-hack-and-its-token-is-up-a-staggering-136","name":"Taiko fully restores cross-chain bridge just 10 days after a $1.7 million hack - CoinDesk","type":"news_article","credibility":1}],"severity":"medium"},{"content":"The Taiko incident is part of a surge in cross-chain bridge exploits in 2026. PeckShield documented $340.7 million in losses across at least 14 bridge exploits during the year as of reporting, making bridges the costliest attack surface in crypto; CryptoTimes had reported bridge hacks topping $328 million by mid-May 2026. The largest single incident was the April 2026 Kelp DAO exploit, in which about $292 million was drained through a compromised LayerZero DVN setup with a 1-of-1 node quorum, allegedly by North Korea's Lazarus Group. Gravity Bridge lost $5.4 million on May 30, 2026, attributed to signing-key compromise rather than a code flaw. The Taiko exploit is categorized as an operational security failure, a private key committed to a public repository, rather than a flaw in Taiko's ZK proof system or consensus. Its vector, a leaked TEE signing credential enabling forged cross-chain proofs, is distinct from oracle manipulation or multisig compromise. Researchers note that the SGX trust model collapses if signing credentials are mishandled, however sophisticated the surrounding cryptography, and that bridges concentrate collateral from multiple chains behind a single verification point.","heading":"Broader Context: 2026 Bridge Exploits","sources":[{"url":"https://beincrypto.com/taiko-bridge-exploit-june-crypto-hacks/","name":"Taiko Exploit Adds to June Tally of Over 20 Crypto Hacks - BeInCrypto","type":"news_article","credibility":2},{"url":"https://www.techtimes.com/articles/318886/20260623/ethereum-l2-bridge-exploit-drains-17m-leaked-sgx-key-defeats-taiko-trust-model.htm","name":"Ethereum L2 Bridge Exploit Drains $1.7M: Leaked SGX Key Defeats Taiko Trust Model - TechTimes","type":"news_article","credibility":2},{"url":"https://cryptodaily.co.uk/2026/06/taiko-bridge-exploit-l2-withdrawal-ux-defi-safety-test","name":"Taiko Bridge Exploit: Why L2 Withdrawal UX Is Becoming a DeFi Safety Test - CryptoDaily","type":"news_article","credibility":2},{"url":"https://blog.thirdweb.com/taiko-bridge-exploit-explained-how-a-leaked-key-led-to-1-7m-in-forged-withdrawals/","name":"Taiko Bridge Exploit: How a Leaked Key Drained $1.7M from an Ethereum L2 - thirdweb Blog","type":"research","credibility":2},{"url":"https://www.chainalysis.com/blog/kelpdao-bridge-exploit-april-2026/","name":"Inside the KelpDAO Bridge Exploit - Chainalysis","type":"research","credibility":1},{"url":"https://www.coindesk.com/tech/2026/04/21/the-usd292-million-kelp-dao-exploit-shows-why-crypto-bridges-are-still-one-of-the-industry-s-weakest-links","name":"The $292 million Kelp DAO exploit shows why crypto bridges are still one of the industry's weakest links - CoinDesk","type":"news_article","credibility":1},{"url":"https://www.cryptotimes.io/2026/05/18/crypto-bridge-hacks-top-328m-in-2026-as-cross-chain-exploits-accelerate/","name":"Crypto Bridge Hacks Top $328M in 2026 as Cross-Chain Exploits Accelerate - CryptoTimes","type":"news_article","credibility":2},{"url":"https://www.cryptbull.net/2026/05/31/cross-chain-protocol-gravity-bridge-suffers-5-4-million-attack-details/","name":"Cross-Chain Protocol Gravity Bridge Suffers $5.4 Million Attack - CryptBull","type":"news_article","credibility":2}],"severity":"medium"}],"timeline":[{"date":"2026-06-21","event":"Attacker begins the exploit sequence, registering two malicious SGX verifier instances (IDs 5 and 6) on Ethereum mainnet with the RSA-3072 signing key exposed in the taikoxyz/raiko repository.","source":"DARKNAVY Blog - Taiko Bridge Source-Signal Proof Forgery","source_url":"https://www.darknavy.org/web3/exploits/taiko-bridge-source-signal-proof-forgery/","date_evidence":"Input page text: 'Technical analysis by DARKNAVY identified a four-phase attack sequence beginning on June 21, 2026.'"},{"date":"2026-06-22","event":"Attacker submits a malicious checkpoint, calls Bridge.processMessage() ten times with forged message hashes, and releases about $1.7 million in USDC, USDT, crvUSD, ETH/WETH and other tokens from the L1 Bridge and ERC20Vault.","source":"DARKNAVY Blog; CoinDesk","source_url":"https://www.coindesk.com/tech/2026/06/22/taiko-halts-its-ethereum-layer-2-network-after-a-bridge-exploit-token-dives-10","date_evidence":"Publication date in the CoinDesk URL path (/2026/06/22/) and input text: 'On June 22, 2026, Taiko ... confirmed that its L1 bridge and ERC20Vault contracts had been exploited'."},{"date":"2026-06-22","event":"Blockaid detects the exploit in real time; Taiko's Security Council pauses the Bridge and ERC20Vault and block production is halted by about 2:08 a.m. ET, roughly eight minutes after detection began.","source":"SpotedCrypto; Taiko official X account","source_url":"https://x.com/taikoxyz/status/2068953220097986953","date_evidence":"Input page text: 'the activity was detected and frozen between roughly 2:00 a.m. and 2:08 a.m. ET on June 22, 2026'."},{"date":"2026-06-22","event":"Taiko urges users to withdraw funds from every bridge on the network and asks exchanges to suspend TAIKO deposits; Upbit and Bithumb suspend TAIKO deposits and withdrawals.","source":"BanklessTimes / Decrypt / MEXC News","source_url":"https://www.banklesstimes.com/articles/2026/06/22/taiko-halts-blocks-after-1-7m-exploit-urges-users-to-exit-bridges/","date_evidence":"Publication date in the Decrypt-cited BanklessTimes URL path (/2026/06/22/)."},{"date":"2026-06-22","event":"Attacker moves about 1.99-2 million TAIKO (reported as $170,000-$189,000) to MEXC; TAIKO falls 10-20%+, touching an all-time low of about $0.07294. BlockSec (Phalcon) and Quill Audits publish preliminary analysis identifying the exposed SGX key as the root cause.","source":"CryptoTimes","source_url":"https://www.cryptotimes.io/2026/06/22/1-7m-gone-taiko-bridge-exploited-after-sgx-signing-key-leak/","date_evidence":"Publication date in the CryptoTimes URL path (/2026/06/22/)."},{"date":"2026-06-22","event":"Recovery pull request #21820 opened at 17:09 UTC against the v3.0.0 protocol branch, bundling checkpoint versioning, Inbox state reset, bridge-message invalidation and QuotaManager restoration.","source":"SpotedCrypto","source_url":"https://www.spotedcrypto.com/taiko-bridge-exploit-june-2026/","date_evidence":"Input page text: 'On June 22, 2026 at 17:09 UTC, Taiko developers opened recovery pull request 21820'."},{"date":"2026-06","event":"Further security analysis published confirming the SGX trust model was defeated by the plaintext key commit; the Ledger CTO publicly attributes the root cause to an operational key-management failure.","source":"TechTimes / Incrypted","source_url":"https://www.techtimes.com/articles/318886/20260623/ethereum-l2-bridge-exploit-drains-17m-leaked-sgx-key-defeats-taiko-trust-model.htm","date_evidence":"Publication date in the TechTimes URL path (/20260623/).","date_original":"2026-06-23"},{"date":"2026-06-25","event":"Taiko says no user will lose funds and announces full 1:1 bridge recollateralization before reopening; Taiko's CEO files a formal report with Singapore authorities.","source":"CryptoTimes","source_url":"https://www.cryptotimes.io/2026/06/25/taiko-to-fully-restore-bridge-backing-after-1-7m-hack/","date_evidence":"Publication date in the CryptoTimes URL path (/2026/06/25/)."},{"date":"2026-06-28","event":"Taiko publishes a four-step restart plan, dated June 28 by crypto.news (June 29 per CryptoBriefing): deploy and audit fixes, recollateralize the bridge 1:1, restore L2 activity, then reopen the bridge with Security Council approval.","source":"crypto.news","source_url":"https://crypto.news/taiko-sets-four-step-restart-plan-after-june-21-bridge-attack/","date_evidence":"Input page text: 'On approximately June 28, 2026, Taiko published a four-step plan to restore the network.'"},{"date":"2026-06-29","event":"Alternative dating (CryptoBriefing): Taiko outlines a four-stage recovery plan covering patching, reserve replenishment, independent security review and a controlled bridge reopening.","source":"CryptoBriefing","source_url":"https://cryptobriefing.com/taiko-reopens-bridge-after-exploit-recovery/","date_evidence":"Input page text: 'Taiko outlined a four-stage recovery plan on June 29, 2026.'"},{"date":"2026-07-02","event":"Taiko bridge reopens under conservative withdrawal quotas after an independent security review; the Security Council authorizes the final unpause, all affected users are confirmed made whole, and TAIKO rises as much as 136%.","source":"CoinDesk","source_url":"https://www.coindesk.com/markets/2026/07/02/taiko-s-bridge-is-back-online-after-usd1-7-million-hack-and-its-token-is-up-a-staggering-136","date_evidence":"Publication date in the CoinDesk URL path (/2026/07/02/) and input text: 'The bridge reopened on July 2, 2026, ten days after the exploit'."}],"sources_used":[{"url":"https://www.coindesk.com/tech/2026/06/22/taiko-halts-its-ethereum-layer-2-network-after-a-bridge-exploit-token-dives-10","name":"Taiko halts its Ethereum layer-2 network after a bridge exploit, token dives - CoinDesk","type":"news_article","archive_url":"http://web.archive.org/web/20260727232054/https://www.coindesk.com/tech/2026/06/22/taiko-halts-its-ethereum-layer-2-network-after-a-bridge-exploit-token-dives-10","credibility":1,"archive_timestamp":"2026-07-27T23:20:54+00:00"},{"url":"https://www.coindesk.com/markets/2026/07/02/taiko-s-bridge-is-back-online-after-usd1-7-million-hack-and-its-token-is-up-a-staggering-136","name":"Taiko fully restores cross-chain bridge just 10 days after a $1.7 million hack - CoinDesk","type":"news_article","archive_url":"http://web.archive.org/web/20260705043250/https://www.coindesk.com/markets/2026/07/02/taiko-s-bridge-is-back-online-after-usd1-7-million-hack-and-its-token-is-up-a-staggering-136","credibility":1,"archive_timestamp":"2026-07-05T04:32:50+00:00"},{"url":"https://www.darknavy.org/web3/exploits/taiko-bridge-source-signal-proof-forgery/","name":"Taiko Bridge Source-Signal Proof Forgery - DARKNAVY Blog","type":"research","archive_url":"http://web.archive.org/web/20260723042537/https://www.darknavy.org/web3/exploits/taiko-bridge-source-signal-proof-forgery/","credibility":2,"archive_timestamp":"2026-07-23T04:25:37+00:00"},{"url":"https://thedefiant.io/news/hacks/taiko-bridge-exploit-sgx-signing-key-github-1-7m","name":"Taiko Bridge Drained $1.7M After SGX Signing Key Left Exposed on GitHub - The Defiant","type":"news_article","archive_url":"http://web.archive.org/web/20260625160807/https://thedefiant.io/news/hacks/taiko-bridge-exploit-sgx-signing-key-github-1-7m","credibility":2,"archive_timestamp":"2026-06-25T16:08:07+00:00"},{"url":"https://blog.thirdweb.com/taiko-bridge-exploit-explained-how-a-leaked-key-led-to-1-7m-in-forged-withdrawals/","name":"Taiko Bridge Exploit: How a Leaked Key Drained $1.7M from an Ethereum L2 - thirdweb Blog","type":"research","archive_url":"http://web.archive.org/web/20260727232054/https://blog.thirdweb.com/taiko-bridge-exploit-explained-how-a-leaked-key-led-to-1-7m-in-forged-withdrawals/","credibility":2,"archive_timestamp":"2026-07-27T23:20:54+00:00"},{"url":"https://www.cryptotimes.io/2026/06/22/1-7m-gone-taiko-bridge-exploited-after-sgx-signing-key-leak/","name":"$1.7M Gone: Taiko Bridge Exploited After SGX Signing Key Leak - CryptoTimes","type":"news_article","archive_url":"http://web.archive.org/web/20260727232059/https://www.cryptotimes.io/2026/06/22/1-7m-gone-taiko-bridge-exploited-after-sgx-signing-key-leak/","credibility":2,"archive_timestamp":"2026-07-27T23:20:59+00:00"},{"url":"https://cryptobriefing.com/taiko-reopens-bridge-after-exploit-recovery/","name":"Taiko reopens bridge after recovering from $1.7M exploit last month - CryptoBriefing","type":"news_article","archive_url":"https://web.archive.org/web/20260729201922/https://cryptobriefing.com/taiko-reopens-bridge-after-exploit-recovery/","credibility":2,"archive_timestamp":"2026-07-29T20:19:22+00:00"},{"url":"https://beincrypto.com/taiko-bridge-exploit-june-crypto-hacks/","name":"Taiko Exploit Adds to June Tally of Over 20 Crypto Hacks - BeInCrypto","type":"news_article","archive_url":"http://web.archive.org/web/20260727050706/https://beincrypto.com/taiko-bridge-exploit-june-crypto-hacks/","credibility":2,"archive_timestamp":"2026-07-27T05:07:06+00:00"},{"url":"https://www.techtimes.com/articles/318886/20260623/ethereum-l2-bridge-exploit-drains-17m-leaked-sgx-key-defeats-taiko-trust-model.htm","name":"Ethereum L2 Bridge Exploit Drains $1.7M: Leaked SGX Key Defeats Taiko Trust Model - TechTimes","type":"news_article","archive_url":"http://web.archive.org/web/20260626130502/https://www.techtimes.com/articles/318886/20260623/ethereum-l2-bridge-exploit-drains-17m-leaked-sgx-key-defeats-taiko-trust-model.htm","credibility":2,"archive_timestamp":"2026-06-26T13:05:02+00:00"},{"url":"https://cryptodaily.co.uk/2026/06/taiko-bridge-exploit-l2-withdrawal-ux-defi-safety-test","name":"Taiko Bridge Exploit: Why L2 Withdrawal UX Is Becoming a DeFi Safety Test - CryptoDaily","type":"news_article","archive_url":"http://web.archive.org/web/20260727094557/https://cryptodaily.co.uk/2026/06/taiko-bridge-exploit-l2-withdrawal-ux-defi-safety-test","credibility":2,"archive_timestamp":"2026-07-27T09:45:57+00:00"},{"url":"https://www.mexc.com/news/1163847","name":"Taiko urges users to exit bridges after a verification flaw - MEXC News","type":"news_article","archive_url":"http://web.archive.org/web/20260727014223/https://www.mexc.com/news/1163847","credibility":2,"archive_timestamp":"2026-07-27T01:42:23+00:00"},{"url":"https://www.spotedcrypto.com/taiko-bridge-exploit-june-2026/","name":"Taiko Bridge Exploit June 2026: $1.7M SGX Key Leak Explained - SpotedCrypto","type":"news_article","archive_url":"http://web.archive.org/web/20260727232042/https://www.spotedcrypto.com/taiko-bridge-exploit-june-2026/","credibility":3,"archive_timestamp":"2026-07-27T23:20:42+00:00"},{"url":"https://bitcoinfoundation.org/news/blockchain-news/ethereum-l2-taiko-hack-forces-bridge-warning-amid-1-7m-exploit/","name":"Taiko Hack Forces Bridge Withdrawal Warning Amid $1.7M Incident - Bitcoin Foundation News","type":"news_article","archive_url":"https://web.archive.org/web/20260727045800/https://bitcoinfoundation.org/news/blockchain-news/ethereum-l2-taiko-hack-forces-bridge-warning-amid-1-7m-exploit/","credibility":2,"archive_timestamp":"2026-07-27T04:58:00+00:00"},{"url":"https://www.banklesstimes.com/articles/2026/06/22/taiko-halts-blocks-after-1-7m-exploit-urges-users-to-exit-bridges/","name":"Taiko Halts Blocks After $1.7M Exploit, Urges Users to Exit Bridges - BanklessTimes","type":"news_article","archive_url":"http://web.archive.org/web/20260724123625/https://www.banklesstimes.com/articles/2026/06/22/taiko-halts-blocks-after-1-7m-exploit-urges-users-to-exit-bridges/","credibility":2,"archive_timestamp":"2026-07-24T12:36:25+00:00"},{"url":"https://coinmarketcap.com/academy/article/taiko-urges-bridge-exit-after-hackers-drain-dollar17m","name":"Taiko Urges Bridge Exit After Hackers Drain $1.7M - CoinMarketCap","type":"news_article","archive_url":"http://web.archive.org/web/20260727092342/https://coinmarketcap.com/academy/article/taiko-urges-bridge-exit-after-hackers-drain-dollar17m","credibility":2,"archive_timestamp":"2026-07-27T09:23:42+00:00"},{"url":"https://coincodex.com/article/86299/ethereum-layer-2-taiko-halts-network-after-17m-exploit-token-falls-11/","name":"Ethereum Layer 2 Taiko Halts Network After $1.7M Exploit, Token Falls 11% - CoinCodex","type":"news_article","archive_url":"https://web.archive.org/web/20260727050627/https://coincodex.com/article/86299/ethereum-layer-2-taiko-halts-network-after-17m-exploit-token-falls-11/","credibility":2,"archive_timestamp":"2026-07-27T05:06:27+00:00"},{"url":"https://incrypted.com/en/ledger-cto-private-key-leak-caused-taiko-hack/","name":"Ledger CTO: Private Key Leak Caused the Taiko Hack - Incrypted","type":"news_article","archive_url":"http://web.archive.org/web/20260727100853/https://incrypted.com/en/ledger-cto-private-key-leak-caused-taiko-hack/","credibility":2,"archive_timestamp":"2026-07-27T10:08:53+00:00"},{"url":"https://www.cryptowisser.com/news/taiko-rollup-confirms-bridge-exploit-after-chain-state-verification-compromise","name":"Taiko Rollup Confirms Bridge Exploit After Chain State Verification Compromise - CryptoWisser","type":"news_article","archive_url":"https://web.archive.org/web/20260727172844/https://www.cryptowisser.com/news/taiko-rollup-confirms-bridge-exploit-after-chain-state-verification-compromise/","credibility":2,"archive_timestamp":"2026-07-27T17:28:44+00:00"},{"url":"https://mpost.io/taiko-loses-1-7m-in-bridge-exploit-suspends-block-production-and-freezes-withdrawals/","name":"Taiko Loses $1.7M In Bridge Exploit, Suspends Block Production And Freezes Withdrawals - Metaverse Post","type":"news_article","archive_url":"https://web.archive.org/web/20260727002012/https://mpost.io/taiko-loses-1-7m-in-bridge-exploit-suspends-block-production-and-freezes-withdrawals/","credibility":2,"archive_timestamp":"2026-07-27T00:20:12+00:00"},{"url":"https://coinpedia.org/news/crypto-news-today-taiko-issues-urgent-warning-after-bridge-security-breach/","name":"Taiko Issues Urgent Warning After Bridge Security Breach - CoinPedia","type":"news_article","archive_url":"https://web.archive.org/web/20260727170513/https://coinpedia.org/news/crypto-news-today-taiko-issues-urgent-warning-after-bridge-security-breach/","credibility":2,"archive_timestamp":"2026-07-27T17:05:13+00:00"},{"url":"https://github.com/taikoxyz/raiko","name":"GitHub - taikoxyz/raiko (public repository containing the Raiko multi-prover stack)","type":"official","archive_url":"http://web.archive.org/web/20260311023903/https://github.com/taikoxyz/raiko","credibility":1,"archive_timestamp":"2026-03-11T02:39:03+00:00"},{"url":"https://www.theblock.co/post/405486/taiko-confirms-exploit","name":"Ethereum Layer 2 Taiko halts block production following exploit - The Block","type":"news_article","archive_url":"http://web.archive.org/web/20260727015439/https://www.theblock.co/post/405486/taiko-confirms-exploit","credibility":1,"archive_timestamp":"2026-07-27T01:54:39+00:00"},{"url":"https://www.tradingview.com/news/cointelegraph:8a1c1fe03094b:0-taiko-urges-users-to-withdraw-as-bridge-exploit-drains-1-7m/","name":"Taiko urges users to withdraw as bridge exploit drains $1.7M - CoinTelegraph via TradingView","type":"news_article","archive_url":"https://web.archive.org/web/20260727015832/https://www.tradingview.com/news/cointelegraph:8a1c1fe03094b:0-taiko-urges-users-to-withdraw-as-bridge-exploit-drains-1-7m/","credibility":2,"archive_timestamp":"2026-07-27T01:58:32+00:00"},{"url":"https://invezz.com/news/2026/06/22/taiko-hits-all-time-low-as-taiko-bridge-exploit-drains-1-7m/","name":"TAIKO hits all-time low as Taiko bridge exploit drains $1.7M - Invezz","type":"news_article","archive_url":null,"credibility":2,"archive_error":"forbiddenaccess","archive_status":"unarchivable","archive_timestamp":null},{"url":"https://coinpaper.com/32148/taiko-confirms-security-breach-and-urges-users-to-withdraw-funds","name":"Taiko Confirms Security Breach and Urges Users to Withdraw Funds - 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