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

Aave has experienced a massive exodus of $6.6 billion in deposits, but it's not due to a direct hack on the platform. The protocol's total value locked plummeted from $26.4 billion on April 18 to nearly $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 didn't create. When attackers drained 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 $236 million. Aave is the largest lending protocol in DeFi, where users deposit crypto to earn yield and others borrow against collateral. Kelp is a liquid restaking protocol that takes ether already staked on Ethereum and routes it through a separate yield-generating system called EigenLayer, issuing a receipt token, rsETH, in exchange. That rsETH is what users trade and post as collateral on Aave to borrow against. On Saturday, attackers tricked Kelp's cross-chain bridge into releasing 116,500 rsETH, worth around $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 transfers tokens between networks that may not originally support them. 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 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, stated 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 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 goes to zero due to a bridge exploit on a chain Aave does not control. The token price is now reflecting the uncertainty surrounding whether Umbrella is sufficient to cover the hole and whether stkAAVE holders who back the reserve will absorb the loss.