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Yearn Finance Suffers yETH Contract Exploit Draining Millions in Assets

Yearn Finance confirmed a $9M exploit in its stableswap pool, recovering roughly one quarter of stolen assets and pledging fixes plus restitution to affected yETH depositors.

Fact Check
The provided sources overwhelmingly and consistently support the statement. Multiple high-authority news outlets, including Coindesk, The Block, and Yahoo Finance, confirm that an exploit targeted Yearn Finance's yETH product. The reporting is specific and aligned on key details: the incident was an exploit (described as an 'unlimited mint attack' on the yETH token contract), it affected the yETH pool, and it resulted in a significant financial loss. Several sources, including The Block and Cryptopolitan, quantify this loss at approximately $3 million, which directly validates the claim of "a loss of assets valued in the millions." Furthermore, The Block reports that the Yearn team confirmed the event. There are no contradictions among the reliable sources; the only low-relevance source is a general news aggregator that can be disregarded. The consistency across multiple credible, independent reports provides high confidence in the statement's truthfulness.
Summary

Yearn Finance disclosed details of a November 30 exploit targeting its stableswap liquidity pool, where attackers exploited a flaw that allowed unlimited LP token minting and drained about $9 million. The protocol recovered 857.49 pxETH, approximately 25% of the stolen funds, which will be redistributed to yETH depositors. Yearn has announced security fixes to address the vulnerability, aiming to prevent future attacks of this nature.

Terms & Concepts
  • yETH token: A Yearn Finance-issued token representing a yield-optimized Ethereum position within the protocol.
  • LP tokens: Liquidity provider tokens issued to individuals who deposit assets into a liquidity pool, representing their share of the pool's assets.
  • Weighted Stableswap Pool: A type of liquidity pool designed for stable assets with assigned weightings, enabling optimized swaps between pegged tokens.