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 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 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 totaling approximately $236 million. Aave is the largest lending protocol in DeFi, where users deposit crypto to earn yields, and others borrow against collateral. Kelp, a liquid restaking protocol, takes ether already staked on Ethereum and routes it through a separate yield-generating system called EigenLayer, issuing a receipt token, rsETH, in exchange. This 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. A bridge is a blockchain-based tool that enables the transfer of 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 softened to 'exploring paths to offset the deficit.' The concentration of the damage is due to Aave's loan book spanning 22 chains, 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 the token's backing vanished on a bridge Aave does not control, leaving depositors vulnerable to losses. Liquid restaking tokens were whitelisted across every major lending protocol because they carried yield and represented a 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 becomes worthless due to a bridge exploit on an unrelated chain. The token price is now attempting to gauge whether the Umbrella reserve is sufficient to cover the resulting hole and whether stkAAVE holders who back that reserve will absorb the loss.