Aave releases post-mortem on $50.43M aEthUSDT-to-aEthAAVE swap loss, cites low liquidity as root cause

Aave released a post-mortem analysis of a March 12, 2026 swap in which a user converted 50,432,688 aEthUSDT, valued at approximately $50.43 million, into aEthAAVE via the CoW Swap router integrated in its interface, with the protocol itself not at risk because the trade occurred through a third-party service, ChainThink reports. The user's order size vastly exceeded available market liquidity and the user accepted a CoW Swap quote already 99.9% below the expected market clearing price, with the adverse result stemming from the user confirming an extremely unfavorable quote after clear interface warnings rather than from execution-time price movement, according to the report. Aave said the core issue was insufficient market liquidity rather than slippage mechanics, and will add an Aave Shield feature to the Swap widget that by default blocks trades with price slippage above 25%, requiring users to opt out for higher-risk transactions. The transaction generated approximately $110,368 in fees, which will be refunded after the user is verified, and the user has not contacted the Aave team to date, the report added.