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

Aave has experienced a massive exodus of $6.6 billion in deposits, and it's 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 because Aave is shouldering a burden it didn't create. When attackers siphoned off 116,500 rsETH from Kelp's bridge on Saturday, they used 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 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. Users trade this rsETH and, crucially, some users posted it on Aave as collateral to borrow against. On Saturday, attackers deceived Kelp's cross-chain bridge into releasing 116,500 rsETH, worth around $292 million, to an address under their control. 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 by Saturday afternoon, the language had shifted to exploring paths to offset the deficit. The concentration of loans on Ethereum explains why the damage is so significant. Aave's loan book spans 22 chains, but Ethereum alone holds $14.24 billion of the $17.82 billion in outstanding borrows, with 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 the token's backing vanished on a bridge Aave does not 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 hold peg under normal conditions, but none of them accounted for a scenario where the collateral becomes worthless due to a bridge exploit on an unrelated chain. As trader Altcoin Sherpa noted on X, 'AAVE is the backbone of DeFi, with billions invested, and nearly 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 token price is now attempting to gauge whether the Umbrella reserve is sufficient to cover the hole and whether stkAAVE holders who back that reserve will absorb the loss.