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

Aave Releases Postmortem on March 12 Swap Event On March 12, 2026, a user executed a token swap via the CoW Swap router integrated into the Aave interface, attempting to exchange 50,432,688 aEthUSDT (≈$50.43 million) for aEthAAVE. The order was disproportionately large relative to available market liquidity, leading CoW Swap to provide an extremely unfavorable quote—which the user confirmed. Notably, the Aave protocol itself was never at risk, as the swap occurred outside the protocol via the third-party service. The affected user has not yet contacted the Aave team. A key takeaway: The issue stemmed from insufficient market liquidity (not slippage). Insufficient liquidity means the market couldn’t fulfill the large order at the target price, causing severe price deviation. The user’s order far exceeded available liquidity, with CoW Swap’s quote being 99.9% lower than the expected market clearing price. The negative outcome resulted from the user confirming the quote, not price fluctuations during execution. The root cause was routing a large trade to a market with inadequate liquidity, leading to extreme price impact. The user proceeded after acknowledging a clear interface warning. To prevent repeats, Aave will add “Aave Shield” to its Swap widget: It will default to blocking swaps with price impacts exceeding 25%, requiring users to manually disable the feature to proceed with high-risk transactions. The transaction generated ~$110,368 in fees, which will be refunded upon user verification.