Symbiosis Finance BridgeV2 syBTC Exploit (September 2026)
Auto-generated score, not yet verified against the scoring model. Under review — treat as indicative, not a verdict.
anchored·2Gv4Hw…nPWaSummary
On September 11, 2026, an attacker exploited two chained vulnerabilities in Symbiosis Finance's BridgeV2 smart contract, depositing 330 satoshis (~$0.25) and minting approximately 46.1 billion unbacked synthetic Bitcoin (syBTC) tokens — over 2,000 times Bitcoin's entire circulating supply. The attacker liquidated roughly 4.39 WBTC (~$336,000) on Uniswap before the incident was contained; Symbiosis recovered approximately 15 BTC (~$1.15 million) and suspended its native Bitcoin bridge pending a full security rewrite. This event is distinct from the broader Symbiosis Finance protocol, which has processed over $10 billion in cross-chain volume since 2022 and whose non-Bitcoin routing remained operational throughout.
Connected Entities
1 entityNo connected entities recorded yet — this investigation is not currently linked to any other page in the index.
Timeline(10 events)
1 March 2022
Symbiosis Finance launched on mainnet; began accumulating audit reports from Decurity, Zokyo, SlowMist, and Omniscia across 11 protocol modules.
Symbiosis Finance Security Audits Documentation1 October 2025
Decurity completed an audit of the Symbiosis Depository module, which relates to bridge and Bitcoin functionality. Whether the BridgeV2 code exploited in September 2026 fell within scope has not been confirmed.
Crypto Briefing — Symbiosis Bitcoin Bridge Exploit11 September 2026
At approximately 04:28 UTC, an attacker submitted 330 satoshis (~$0.25) to the BridgeV2 contract and executed 12 irregular transactions across BNB Chain, Ethereum, and Rootstock over roughly four minutes, exploiting two chained bugs to mint approximately 46.1 billion unbacked syBTC tokens to a freshly created EOA.
KuCoin News — Symbiosis Hit by $770K Loss11 September 2026
Blockaid detected anomalous on-chain activity in real time and publicly flagged the exploit via X (formerly Twitter).
Blockonomi — Symbiosis Bitcoin Bridge Hacked11 September 2026
The attacker bridged a portion of the minted syBTC tokens to Ethereum and sold approximately 4.39 WBTC through Uniswap V4, realizing approximately $336,000 in proceeds. Remaining tokens found no market demand.
CoinCentral — Symbiosis Bitcoin Bridge Exploit11 September 2026
Symbiosis Finance suspended all native Bitcoin bridge routes upon confirming the exploit. EVM, TRON, TON, and Octopool routes remained operational.
Crypto Briefing — Symbiosis Bitcoin Bridge Exploit11 September 2026
Symbiosis announced it had recovered approximately 15 BTC (~$1.15 million) and secured the funds in a team-controlled multisignature wallet. The protocol offered the attacker a 20% white-hat bounty on returned funds, with a deadline of September 13, 2026.
CoinPaprika — A Hacker Minted 46 Billion Fake Bitcoin13 September 2026
White-hat bounty deadline expired. The attacker did not publicly respond or return funds. Symbiosis redirected the 20% offer to anyone providing intelligence leading to further recovery.
The Currency Analytics — Symbiosis Recovers 15 BTC14 September 2026
Multiple news outlets published coverage. Symbiosis stated final loss figures were still being calculated and that it was contacting affected liquidity providers directly to build a compensation framework. No timeline for BridgeV2 relaunch was given; a complete software rewrite and new external audit were announced as prerequisites.
The Currency Analytics — Symbiosis Recovers 15 BTC14 September 2026
Bitcoin swaps restored through third-party partners Chainflip and THORChain while Symbiosis's own Bitcoin Bridge remained suspended.
Blockonomi — Symbiosis Bitcoin Bridge HackedDecision Log
- hash: GY97u8hV9gum1MAsTG9HFZSiFUXwuSiixBRCz9ipK6DG
This investigation is cryptographically anchored to the Solana blockchain (1 event). 0 of 13 cited source URLs have an Internet Archive snapshot.
model: claude-sonnet-4-6
generated: 9/17/2026, 5:04:18 PM
last updated: 9/17/2026, 5:04:42 PM
avoid.net — verified advice for a post-truth world