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

Aave has witnessed a staggering $6.6 billion exodus, not due to a direct hack on its 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 because Aave is shouldering a liability 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 against them. On-chain trackers estimate the Aave-specific borrow to be around $196 million, with total positions across Aave, Compound, and Euler nearing $236 million. Aave, the largest lending protocol in DeFi, allows users to deposit crypto to earn yields, while others borrow against collateral. Kelp is a liquid restaking protocol that 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 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. 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 damage is attributed to Aave's loan book, which spans 22 chains, but with Ethereum alone holding $14.24 billion of the $17.82 billion in outstanding borrows. 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, leaving depositors vulnerable to losses. Liquid restaking tokens were whitelisted across major lending protocols due to their yield and representation 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. 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 exposes the fragility of the entire system.' The token price is now reflecting concerns over whether Umbrella is sufficient to cover the resulting hole and whether stkAAVE holders who back that reserve will absorb the loss.