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Hyperbridge has released an update on the attack incident; the vulnerability stems from a flaw in the Merkle proof verification logic.
ME News Report, April 13 (UTC+8), the blockchain interoperability protocol Hyperbridge disclosed details of a prior DOT attack incident, with losses of approximately $237k. The root cause of the vulnerability was that the HandlerV1 contract’s VerifyProof() function lacked input validation, failing to verify that leaf_index < leafCount, which allowed attackers to forge Merkle proofs. Using this, the attacker obtained administrator privileges over the bridged DOT token contract on Ethereum, then minted 1 billion bridged DOT tokens (about 2800+ times the legitimate circulating supply of approximately 356k tokens) and cashed out on a decentralized exchange. Hyperbridge stated that they are currently working with security partners to trace the funds, and cross-chain functionality will remain suspended until the investigation is complete. (Source: Foresight News)