1inch loses $5 million to smart contract bug

An attacker exploited a smart contract belonging to the 1inch DEX aggregator, stealing $5 million in the USDC stablecoin and wETH. According to the platform, the vulnerability existed in "smart contracts using the obsolete Fusion v1 implementation", and the stolen funds belonged to resolvers (that is, entities that fulfill 1inch orders) rather than users. Tweet by 1inch Tweet thread by SlowMist

Mar 8, 2025 - 04:08
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1inch loses $5 million to smart contract bug
An illustration of an angry unicorn head followed by "1inch" in blocky dark navy letters

An attacker exploited a smart contract belonging to the 1inch DEX aggregator, stealing $5 million in the USDC stablecoin and wETH. According to the platform, the vulnerability existed in "smart contracts using the obsolete Fusion v1 implementation", and the stolen funds belonged to resolvers (that is, entities that fulfill 1inch orders) rather than users.