TREE NEWS update: An attacker exploited a vulnerability in cross-chain protocol Symbiosis’s Bitcoin bridge, minting roughly 2^62 syBTC — a face value of about $46.1 billion at eight decimals — into a new externally owned account. The attacker sold about 4.39 WBTC on Uniswap V4 on Ethereum, realizing roughly $336,000. Symbiosis said the attack occurred around 04:28 on September 11 and that it has paused BTC routing while other routes remain unaffected.
Symbiosis Bitcoin bridge exploit mints $46.1B in syBTC, attacker nets $336K
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AI take
The headline figure is misleading: the $46.1 billion is nominal minting at eight decimals, while the attacker extracted only about $336,000 by selling a small WBTC position. The real issue is bridge design — an unbounded mint that the market could absorb for only a fraction of face value suggests thin liquidity and weak supply controls, not a systemic loss of that size. The watch item is how Symbiosis handles the paused BTC route and whether other cross-chain Bitcoin bridges face similar scrutiny.
Generated by AI for reference only.
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