A serious security incident has occurred on the DeFi lending protocol Moonwell after the smart contract code was allegedly written with the involvement of AI model Claude Opus 4.6. According to smart contract auditor Pashov, the code generated by Claude Opus 4.6 contains a critical vulnerability, leading to an exploit that caused approximately $1.78 million in damages.
Specifically, the price of cbETH was set incorrectly at $1.12 instead of around $2,200, enabling attackers to manipulate the system. The project’s pull requests (PRs) show several commits co-authored by Claude, raising the possibility that this is the first hack related to Solidity code in a “vibe-coding” style supported by AI.
SlowMist founder Cos stated that the root cause stemmed from a low-level error in the oracle price feed formula.
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