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

Aave has witnessed a staggering $6.6 billion exodus in deposits, not due to a direct hack on the protocol itself. The total value locked in Aave plummeted from $26.4 billion on April 18 to approximately $20 billion by Sunday morning, according to DefiLlama. The AAVE token suffered a 16% decline to $92, while daily fees surged to $1.99 million as liquidations swept through the weekend. Depositors are fleeing because Aave is now carrying a significant financial burden it did not create. When attackers drained 116,500 rsETH from Kelp's bridge on Saturday, they utilized 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 reaching approximately $236 million. Aave, the largest lending protocol in DeFi, allows users to deposit cryptocurrency to earn yields, while other users borrow against collateral. Kelp, a liquid restaking protocol, takes already staked ether 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, approximately $292 million worth, 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 the transfer of tokens between networks that may not originally support them. Initially, Aave 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, with $14.24 billion of the $17.82 billion in outstanding borrows, explains why the damage is significant. WETH accounts for 39.49% of all loans on the protocol, meaning 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, ultimately affecting depositors. Liquid restaking tokens were whitelisted across every major lending protocol due to their yield and 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 becomes worthless due to a bridge exploit on a chain Aave does not control. As trader Altcoin Sherpa noted on X, 'AAVE is the backbone of DeFi, with billions invested, and pretty much every new DeFi infrastructure on new chains is a fork of it. When AAVE has contagion risk, it reveals the fragility of the entire system.' The current token price is attempting to gauge whether Umbrella is sufficient to cover the resulting hole and whether stkAAVE holders backing that reserve will absorb the loss.