• A user attempting to swap $50.4M in aEthUSDT for AAVE through Aave’s interface powered by CoW Swap received only about 324 AAVE (around $36K–$37K) due to severe price impact in a low liquidity market.
• After the incident, Aave introduced ‘Aave Shield,’ which acts as a new protective mechanism that prevents all trades with price impacts exceeding 25% from occurring.

Aave has introduced the Aave Shield protection system for its decentralized lending platform after a major trading event resulted in a user losing millions due to extreme slippage. The safeguard system stops trades that generate excessive price impact while building a protection mechanism that prevents identical future occurrences. The incident occurred on March 12 when a user attempted to swap approximately $50.4 million in aEthUSDT for the protocol’s native token through Aave’s interface. The user completed the transaction through CoW Swap, which serves as a decentralized exchange aggregation service that works with Aave’s platform. The specific trading pair faced extremely low market liquidity, which altered the transaction. The swap process experienced major price impact; as a result, the user received only about 324 AAVE, which had a value between $36,000 and $37,000 at the time of execution.

Protocols Publish Post-Mortem Reports

After the incident, Aave and CoW Swap published complete post-mortem reports that showed their investigations into the transaction failure. Aave discovered that the core protocol functioned correctly as it maintained complete operational security throughout its entire process. These included outdated gas limits and execution errors in solving systems that needed to complete trade processing and the potential for transaction information to leak through a private mempool. The technical breakdown probably changed how the order was processed and executed between different liquidity sources.

Introducing Aave Shield

Aave will implement Aave Shield as a response to the incident, which will automatically stop trades when they reach their specified price-impact limit. This new safeguard will prevent users from executing swaps that could move the market price by more than 25 percent. The system prevents processing of large orders, which would create excessive slippage in markets that lack sufficient liquidity.

Stani Kulechov, founder of Aave, stated that the protocol itself worked as designed during the transaction. However, he acknowledged that the outcome was highly unfavorable for the user. He added that the platform will refund about $600,000 in fees, which the transaction generated as part of the response.

Earlier today, a user attempted to buy AAVE using $50M USDT through the Aave interface.

Given the unusually large size of the single order, the Aave interface, like most trading interfaces, warned the user about extraordinary slippage and required confirmation via a checkbox.…

— Stani.eth (@StaniKulechov) March 12, 2026

A Reminder About Liquidity Risks

The incident demonstrates how execution of large trades in decentralized markets with low liquidity presents dangerous execution risks. DeFi platforms enable users to trade without restrictions, yet price impact and market depth still determine how trades will turn out. The protocol plans to enhance its protective measures through the Aave Shield introduction, which will help prevent future occurrences of severe slippage consumption.

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