Aave has released a full post-incident explanation of the massive swap loss tied to its interface and said it will deploy a new protection layer called Aave Shield. The feature will, by default, block any swap with price impact above 25%. The change follows a transaction in which a user exchanged 50,432,688 aEthUSDT for aEthAAVE through the Aave interface and ended up receiving only about 327.2413 aEthAAVE, valued in the report at roughly $36,425.
A $50.4 million position was converted into roughly $36,000 in value
According to Aave, the transaction took place on March 12, 2026. The user attempted to swap 50,432,688 aEthUSDT, worth $50,432,688, into aEthAAVE through a CoW Swap routing component integrated into the Aave front end. Because the order size was exceptionally large relative to available liquidity, the quote returned by CoW Swap solvers was extremely poor, and the user accepted it.
Aave said the issue was not slippage in the usual sense. It was a liquidity problem that created an extreme price impact. In Aave’s account, the quote was 99.9% below the expected market liquidation value of the underlying assets behind aEthUSDT and aEthAAVE, meaning the unfavorable outcome was effectively embedded in the quote before execution.
The interface showed a severe warning before the trade was confirmed
Aave said its swap component displayed a clear alert to the user, including a message that indicated high price impact (99.9%). The interface also warned that the route could return fewer assets because of low liquidity or order size. To proceed, the user had to tick a box confirming: I understand this swap and accept a potential 100% loss of value.
The company said internal audit logs show the user was operating on a mobile device and manually checked the confirmation box before moving ahead. Aave also stated that, so far, the user has not contacted the team.
On-chain route moved through USDT, WETH and AAVE pools
The report laid out the execution path step by step. The user’s 50,432,688 aEthUSDT was first sent to CoW Protocol’s GPv2Settlement contract. A solver then redeemed those tokens on Aave V3 into 50,432,688 native USDT. That USDT was routed into the Uniswap V3 USDT/WETH pool, producing 17,957.81 WETH, which Aave valued at $37,316,623.
The WETH was then routed into SushiSwap’s AAVE/WETH pool, where it bought 331.3053 AAVE, reported at just $36,930. Those tokens were deposited into Aave V3 and minted into 331.3053 aEthAAVE. In the end, CoW Swap sent 327.2413 aEthAAVE to the user’s wallet and kept 4.064 aEthAAVE as surplus, worth about $452 according to the report.
Aave says the core protocol was never at risk
Aave stressed that the incident did not affect the core lending protocol. The swap happened through a front-end feature on aave.com that integrates CoW Swap, not through Aave’s core smart contracts. In its explanation, Aave said the protocol itself never faced risk from the transaction.
The company also noted that wallets connecting to aave.com are screened by TRM Labs and Chainalysis for suspicious activity and AML/CFT compliance. That screening process, though, was separate from the pricing failure in this case.
Shield will be enabled by default on the interface
The main product response is the introduction of Aave Shield. Under the new setup, swaps with price impact above 25% will be automatically blocked by default. Users who still want to carry out such trades will need to go into the settings menu and deliberately disable the protection before they can proceed.
Aave described the feature as an added layer of friction designed to reduce accidental confirmations while still leaving room for permissionless execution for advanced users.
Aave says the $110,368 interface fee will be held for a refund
The transaction generated a $110,368 swap fee, based on a 25 basis point rate, collected by the aave.com interface. Aave said that figure was lower than the early preliminary estimate published on March 12. The company added that if the user gets in touch and completes the verification process, the funds will be retained and returned to the user.
Aave said it will continue monitoring the case and work with internal teams and CoW Swap to adjust the swap experience on aave.com.