Hyperbridge HandlerV1 Contract Vulnerability Exposes Cross-Chain Message Forgery Risk

2026-04-13 16:21

BlockSec Phalcon has identified a vulnerability in the Hyperbridge HandlerV1 contract due to missing input validation. The VerifyProof() function fails to verify that leaf_index is less than leafCount, which can result in the MMR calculation excluding the requested commitment under certain parameters. This flaw allows attackers to forge seemingly valid cross-chain messages by decoupling the proof from the actual message.

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