ChainThink reports that on March 15, Aave released a post-event analysis of the Swap incident: “On March 12, 2026, a user executed a token swap via the CoW Swap router integrated into Aave’s interface. The user attempted to exchange 50,432,688 aEthUSDT (valued at approximately $50.43 million) for aEthAAVE. Due to the unusually large size of the user’s order in a low-liquidity market, the quote provided by CoW Swap was extremely unfavorable, yet the user confirmed and accepted it. It should be noted that the Aave protocol itself was never at risk, as this swap occurred outside the protocol via the aforementioned third-party swap service. To date, the relevant user has not contacted the Aave team.”
The key issue in this event is insufficient market liquidity, not slippage. Insufficient liquidity means there aren't enough assets available at a specific price to fulfill a large order, causing significant price deviation. The user’s order far exceeded the available market liquidity; the CoW Swap quote was already 99.9% lower than 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 event was a large transaction routed through a market with insufficient liquidity, resulting in extreme price slippage. The user executed the trade after confirming clear warnings on the interface. To prevent similar incidents, Aave Shield will be launched in the Swap widget: it will default to blocking exchanges with price slippage exceeding 25%, requiring users to manually disable it to proceed with high-risk trades. The transaction generated approximately $110,368 in fees, which will be refunded after user verification.