Symbiosis Recovers 15 BTC After Bitcoin Bridge Exploit

A recent attack on Symbiosis's Bitcoin Bridge resulted in an estimated $46.1 billion notional loss, but actual losses were much lower at around $336,000.

The breach occurred on September 11, 2026, when an attacker exploited a vulnerability in the BridgeV2 contract to mint a massive quantity of unbacked syBTC tokens.

However, the attacker's ability to convert only 4.39 WBTC on Uniswap V4 kept actual losses relatively contained.

Symbiosis responded quickly by halting all BTC-related routing and recovering around 15 BTC from the exploit.

The protocol offered a 20% bounty to the attacker, with a deadline of September 13, 2026, in exchange for returning or recovering funds.