Aave Releases Post-Mortem on "Buy AAVE" Incident Causing $50 Million in Losses: Core Issue Was Insufficient Market Liquidity, Not Slippage

BlockBeats News, March 15th, Aave released a Swap Event Postmortem:「On March 12, 2026, a user performed a token exchange operation by utilizing the CoW Swap router integrated into the Aave interface. The user attempted to exchange 50,432,688 aEthUSDT (valued at approximately $50.43 million) for aEthAAVE. Due to the user's order being disproportionately large in a market with insufficient liquidity, the CoW Swap provided an extremely unfavorable quote, which the user confirmed. It is important to note that the Aave protocol itself was never at risk as this exchange occurred outside the protocol through the aforementioned third-party Swap protocol. Currently, the affected user has not yet contacted the Aave team.

The key point of this event lies in the insufficient market liquidity rather than slippage. Insufficient liquidity refers to the market's inability to provide enough assets at a specific price to fulfill large orders, leading to a significant price deviation. The user's order far exceeded the available market liquidity, with the CoW Swap quote being 99.9% lower than the expected market clearing price. The adverse outcome resulted from the user confirming the quote rather than price changes during execution.

The root cause of this event is the routing of large trades in a market with inadequate liquidity, resulting in extreme price impact. The user executed the transaction after acknowledging a clear warning on the interface. To prevent similar events, Aave will introduce Aave Shield in the Swap widget: it will default to blocking exchanges with price impacts exceeding 25%, requiring users to manually disable it to proceed with high-risk transactions. The transaction generated approximately $110,368 in fees, which will be refunded after user verification.」