Yearn Finance, the veteran yield-aggregation protocol, has suffered another attack that drained millions from yETH, a Yearn token that bundles several types of staked Ethereum into a single asset.

In a thread on X, the Yearn Finance team confirmed that on Sunday, an incident occurred involving the yETH stableswap pool that resulted in the minting of a “large amount of yETH.”

In a post-mortem report on Monday morning, the team wrote that the incident is the result of the intersection of a “low-level numerical bug” and a “high-level invariant-management issue.”

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