TREE NEWS update: Cross-chain protocol Symbiosis said on September 11 that its Bitcoin-related swap function is temporarily unavailable while the team deploys an update, adding that other swaps and protocol operations remain live. Web3 security firm Blockaid had flagged an attack on Symbiosis on BNB Smart Chain, where an attacker used a signed BridgeV2 receive operation to mint roughly 2^62 raw units of syBTC to a new address. The same beneficiary then sold about 4.39 WBTC on Ethereum’s Uniswap V4, cashing out roughly $336,000.
Symbiosis Suspends Bitcoin Swaps After BSC Bridge Exploit
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AI take
The exploit's mechanics are the story: a signed BridgeV2 receive operation let an attacker mint syBTC without collateral, then convert it into real WBTC on Ethereum — a reminder that bridge minting authority, not liquidity, is the fragile point. Symbiosis' choice to keep other swaps live while disabling only Bitcoin-related functions suggests the blast radius is contained to that asset path. Whether the minted units are burned, whether the affected beneficiary's Ethereum-side proceeds are traced or frozen, and how the signed-operation validation is changed are the open questions.
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