Aave Releases Post-Incident Analysis of $50 Million Loss from AAVE Purchase: Core Cause Was Insufficient Market Liquidity, Not Slippage

ChainCatcher Message: Post-Event Analysis of Aave Swap Incident:
A user executed a token swap through the CoW Swap router integrated into the Aave interface. The user attempted to exchange 50,432,688 aEthUSDT (worth approximately $50.43 million) for aEthAAVE. Due to the unusually large size of the order in a market with insufficient liquidity, CoW Swap’s quote was extremely unfavorable, yet the user confirmed acceptance of the quote.

It should be noted that the Aave protocol itself was never at risk, as this swap occurred outside the protocol via a third-party swap service. The user has not yet contacted the Aave team. The key issue in this incident is market illiquidity, not slippage.

Illiquidity means that at a specific price point, the market cannot provide enough assets to fulfill large orders, causing significant price deviations. The user’s order far exceeded available market liquidity, and CoW Swap’s quote was 99.9% below the expected market clearing price. The adverse outcome resulted from the user confirming the quote, not from price changes during execution.

The root cause of this incident is routing a large transaction in a market with insufficient liquidity, leading to extreme price impact. The user confirmed a clear warning on the interface before executing the trade. To prevent similar events, the Swap widget will introduce Aave Shield: by default, blocking swaps that would cause more than 25% price impact. Users must manually disable this feature to execute high-risk trades. The transaction incurred approximately $110,368 in fees, which will be refunded after user verification.