Aave Faces $6 Billion Deposit Exodus Following Kelp Hack, Exposing DeFi Lender's Structural Vulnerabilities

Aave has witnessed a staggering $6.6 billion departure, and it's not due to a direct hack on the platform. The protocol's total value locked plummeted from $26.4 billion on April 18 to approximately $20 billion by Sunday morning, according to DefiLlama. The AAVE token dropped 16% to $92, while daily fees surged to $1.99 million as liquidations swept through the weekend. Depositors are fleeing because Aave is shouldering a burden it did not create. When attackers siphoned off 116,500 rsETH from Kelp's bridge on Saturday, they proceeded to dump the stolen tokens on Aave V3 as collateral and borrow wrapped ether against them. On-chain trackers estimate the Aave-specific borrow to be around $196 million, with total positions across Aave, Compound, and Euler reaching $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 ether that has already been staked on Ethereum and channels it through a separate yield-generating system called EigenLayer, issuing a receipt token, rsETH, in exchange. That rsETH is what users trade and, critically, what some users posted on Aave as collateral to borrow against. On Saturday, attackers tricked Kelp's cross-chain bridge into releasing 116,500 rsETH, worth approximately $292 million, to an address they controlled. They then deposited the stolen rsETH onto Aave V3 as collateral and borrowed wrapped ether against it. A bridge is a blockchain-based tool that facilitates token transfers between networks that may not originally support them. Aave initially stated that the Umbrella reserve would cover any deficit, but by Saturday afternoon, the language had softened to 'exploring paths to offset the deficit.' The concentration of Aave's loan book on Ethereum explains why the damage is so severe. With $14.24 billion of the $17.82 billion in outstanding borrows held on Ethereum alone, and WETH accounting for 39.49% of all loans on the protocol, the attack targeted the exact collateral-to-WETH pair that dominates Aave's book. 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 that token's backing vanished on a bridge Aave does not control, leaving depositors vulnerable to losses. Liquid restaking tokens were whitelisted across every major lending protocol due to their yield and representation of a growing share of Ethereum's locked value. Risk models priced them as if they would hold peg under normal conditions, but none accounted for a scenario where the collateral goes to zero because a bridge on a chain Aave does not touch got exploited on a Saturday. The token price is now attempting to determine whether Umbrella is sufficiently large to cover the hole and whether stkAAVE holders who back that reserve will absorb the loss.