wormhole

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vulnerability

Threshold Network's L2WormholeGateway contract contained a critical vulnerability allowing attackers to mint unlimited canonical L2 tBTC by exploiting the depositWormholeTbtc function through reentrancy via a malicious ERC20 token's transfer callback. The vulnerability was discovered via Immunefi bug bounty, patched by removing the vulnerable function and adding reentrancy protection, with no funds lost.

Threshold Network tBTC Immunefi Wormhole L2WormholeGateway Arbitrum Base Optimism Polygon Bitcoin
blog.threshold.network · unknown · 4 hours ago · details