馃毃 Yearn Finance Loses $9M

馃毃 $9M Gone Fast

By Forta
Dec 4, 2025, 2:54 PM
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Yearn Finance suffered a $9M exploit on mainnet through a sophisticated price manipulation attack.​

How the attack worked:

  • Attacker drained liquidity pools
  • Broke pricing mechanisms
  • Minted cheap yETH tokens
  • Sold them for regular ETH at inflated prices

Detection vs Prevention: Forta Firewall flagged the exploit in real time but couldn't stop it.​ The attack happened so fast that only real-time detection was possible.​

Key insight: Pre-execution screening could have prevented this attack entirely rather than just detecting it after the damage was done.​

This follows a pattern of recent price manipulation exploits, including attacks on DRLVaultV3 ($100K) and RWB ($180K), highlighting the critical need for proactive security measures in DeFi protocols.​

Sources
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