Aave Faces $6 Billion Deposit Exodus After Kelp Hack Exposes DeFi Lender's Structural Vulnerability

Aave has experienced a massive exodus of $6.6 billion in deposits, not due to a direct hack on the platform. The total value locked in the protocol plummeted from $26.4 billion on April 18 to approximately $20 billion by Sunday morning, according to DefiLlama. The AAVE token saw a 16% decline to $92, while daily fees surged to $1.99 million as liquidations swept through the weekend. Depositors are fleeing Aave due to a hole created by an external exploit. Attackers drained 116,500 rsETH from Kelp's bridge on Saturday, using the stolen tokens as collateral on Aave V3 to borrow wrapped ether. On-chain trackers estimate the Aave-specific borrow to be around $196 million, with total positions across Aave, Compound, and Euler at approximately $236 million. Aave, the largest lending protocol in DeFi, allows users to deposit crypto to earn yield, while others borrow against collateral. Kelp, a liquid restaking protocol, takes already-staked ether on Ethereum and routes it through a separate yield-generating system called EigenLayer, issuing a receipt token, rsETH. This rsETH is traded by users and, crucially, used as collateral on Aave to borrow against. On Saturday, attackers tricked Kelp's cross-chain bridge into releasing 116,500 rsETH, worth about $292 million, to a controlled address. They then deposited the stolen rsETH onto Aave V3 as collateral and borrowed wrapped ether against it. Aave initially stated that the Umbrella reserve would cover any deficit but later softened its stance to exploring paths to offset the deficit. The concentration of damage is due to Aave's loan book spanning 22 chains, with Ethereum holding $14.24 billion of the $17.82 billion in outstanding borrows. WETH accounts for 39.49% of all loans on the protocol, making the attack particularly impactful. Stani Kulechov, Aave's founder, emphasized that the exploit was external and the protocol's contracts were not compromised. However, Aave accepted a liquid restaking token as collateral, and its backing vanished on a bridge outside Aave's control, leaving depositors vulnerable to losses. Liquid restaking tokens were whitelisted across major lending protocols due to their yield and growing share of Ethereum's locked value. Risk models priced them as if they would maintain their peg under normal conditions but did not account for a scenario where the collateral becomes worthless due to a bridge exploit on an unrelated chain. The token price now reflects concerns about whether the Umbrella reserve is sufficient to cover the resulting hole and whether stkAAVE holders backing the reserve will absorb the loss.