Symbiosis Bitcoin Bridge Vulnerability Leads to $46.1 Billion syBTC Minting Incident

Security platform Blockaid identified a vulnerability in the Symbiosis cross-chain protocol's Bitcoin bridge, allowing an attacker to mint approximately 2^62 syBTC, valued at roughly $46.1 billion. The attacker sold about 4.39 WBTC on Uniswap V4, netting approximately $336,000. The incident occurred on September 11 at 4:28. Symbiosis has suspended its BTC routing, though other routes remain operational. The team has recovered about 15 BTC and offered a 20% white-hat bounty to the attacker, with a deadline of September 13. This follows similar security incidents involving unauthorized token minting at Liquid Network and Nomic.