ChainThink report, March 15: Aave publishes post-event analysis of the Swap incident: "On March 12, 2026, a user executed a token swap via 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 exceptionally large size of the user’s order in an illiquid market, the CoW Swap quote was severely unfavorable, yet the user confirmed and proceeded with the quote. It is important to clarify that the Aave protocol itself was never at risk, as this swap occurred off-protocol through the third-party Swap mechanism. At present, the involved user has not reached out to the Aave team."

The core issue in this incident lies not in slippage but in market illiquidity. Illiquidity refers to the inability of a market to provide sufficient asset volume at a specific price level to fulfill large orders, resulting in significant price divergence. The user’s order vastly exceeded available market liquidity, and the CoW Swap quote was 99.9% below the expected market liquidation price. The adverse outcome stemmed from the user’s confirmation of the quote, not from dynamic price changes during execution.

The root cause of this event was routing a large transaction through an illiquid market, leading to extreme price impact. The user executed the trade after explicitly acknowledging clear warnings on the interface. To prevent similar incidents in the future, Aave Shield will be introduced within the Swap component: default protection will block swaps with price impact exceeding 25%, requiring manual override for high-risk transactions. The transaction incurred approximately $110,368 in fees, which will be refunded upon user verification."