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

Aave has witnessed a staggering $6.6 billion exodus, not due to a direct hack, but as a result of a cascading effect triggered by the Kelp bridge exploit. 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 shouldering a burden it did not create. When attackers siphoned off 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 nearing $236 million. As the largest lending protocol in DeFi, Aave enables users to deposit cryptocurrency to earn yield, while others 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, crucially, what some users posted as collateral on Aave to borrow against. On Saturday, attackers deceived Kelp's cross-chain bridge into releasing 116,500 rsETH, valued at approximately $292 million, to a controlled address. 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. Initially, Aave stated that the Umbrella reserve would cover any deficit. However, by Saturday afternoon, the language had shifted to "exploring paths to offset the deficit." The concentration of Aave's loan book on Ethereum explains why the damage is so pronounced. With $14.24 billion of the $17.82 billion in outstanding borrows held on Ethereum, and WETH comprising 39.49% of all loans on the protocol, the attack struck 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. Nevertheless, 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 major lending protocols due to their yield and growing share of Ethereum's locked value. Risk models priced them as if they would maintain peg under normal conditions. However, none of them accounted for a scenario where the collateral would plummet to zero due to a bridge exploit on an unrelated chain. "AAVE is the backbone of DeFi, with billions invested, and nearly every new DeFi infrastructure on new chains is a fork of it," trader Altcoin Sherpa wrote on X. "When AAVE faces contagion risk, it exposes the fragility of the entire system." The token price is now grappling with whether the Umbrella reserve is sufficient to cover the shortfall and whether stkAAVE holders who back that reserve will absorb the loss.