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

Aave has experienced a significant exodus of deposits, with $6.6 billion withdrawn, not due to a direct hack on the platform.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 suffered a 16% decline to $92, while daily fees surged to $1.99 million as liquidations swept through the weekend. Depositors are fleeing due to Aave's exposure to a risk 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 totaling 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 EigenLayer, issuing a receipt token, rsETH, in exchange. This rsETH is what users trade and, crucially, what some users posted as collateral on Aave to borrow against. On Saturday, attackers tricked Kelp's cross-chain bridge into releasing 116,500 rsETH, worth approximately $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 'explore 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. The attack targeted the exact collateral-to-WETH pair that dominates Aave's book, with WETH accounting for 39.49% of all loans on the protocol. Aave's founder, Stani Kulechov, acknowledged 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 maintain their peg under normal conditions, but none accounted for a scenario where the collateral becomes worthless due to a bridge exploit on an unrelated chain. The token price is now reflecting the uncertainty surrounding whether Umbrella is sufficient to cover the resulting hole and whether stkAAVE holders who back the reserve will absorb the loss.