Aave Liquidations Highlight Risks of Minor Technical Issues in DeFi

A recent incident on the Aave lending protocol highlights the potential for minor technical issues to have significant financial consequences in decentralized finance (DeFi). A 2.85% price discrepancy in wstETH collateral led to $27 million in liquidations, demonstrating how automated mechanisms can amplify small pricing errors.

The root cause of the incident was a misconfiguration in Aave's correlated assets price oracle (CAPO) risk oracle system. The CAPO module is designed to cap the rate at which the value of yield-bearing tokens like wstETH can rise, but an outdated parameter caused the protocol to undervalue wstETH by approximately 2.85% relative to its market value.

The liquidation cascade was triggered when collateral ratios fell below the required thresholds, and high-speed trading bots took advantage of the temporary pricing misalignment to extract around 499 ETH in combined profits and liquidation bonuses.