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

Aave has witnessed a staggering $6.6 billion exit, 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 nearly $20 billion by Sunday morning, according to DefiLlama. The AAVE token experienced a 16% decline to $92, while daily fees surged to $1.99 million amidst widespread liquidations over the weekend. Depositors are fleeing because Aave is now shouldering a burden it did not create. When attackers siphoned off 116,500 rsETH from Kelp's bridge on Saturday, they proceeded to use 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 approximately $236 million. As the largest lending protocol in DeFi, Aave enables users to deposit cryptocurrency to earn yields, while others borrow against collateral. Kelp, a liquid restaking protocol, redirects already-staked ether on Ethereum 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 as collateral on Aave to borrow against. On Saturday, attackers deceived Kelp's cross-chain bridge into releasing 116,500 rsETH, worth about $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, but by Saturday afternoon, the language had shifted to exploring 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, and WETH comprising 39.49% of all loans, explains why the damage is so significant. Aave's founder, Stani Kulechov, 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 major lending protocols due to their yield and representation of Ethereum's locked value. Risk models priced them as if they would maintain 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 concerns about whether Umbrella is sufficient to cover the resulting hole and whether stkAAVE holders, who back the reserve, will absorb the loss.