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, but the cause lies not with the protocol itself. The total value locked in Aave dropped 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 amidst a wave of liquidations over the weekend. Depositors are fleeing due to a hole in Aave's balance sheet that it did not create. Attackers drained 116,500 rsETH from Kelp's bridge on Saturday, using 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. As the largest lending protocol in DeFi, Aave allows users to deposit crypto to earn yield, while others borrow against collateral. Kelp, a liquid restaking protocol, takes ether already staked on Ethereum and routes it through EigenLayer, issuing a receipt token called rsETH. This rsETH is traded by users and, crucially, used as collateral on Aave to borrow against. On Saturday, attackers exploited Kelp's cross-chain bridge, releasing 116,500 rsETH, worth approximately $292 million, to a controlled address. They then deposited the stolen rsETH onto Aave V3 as collateral, borrowing 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 so significant. WETH accounts for 39.49% of all loans on the protocol, meaning the attack targeted the dominant collateral-to-WETH pair in Aave's book. 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 outside Aave's control, leaving depositors vulnerable to losses. The risk models for liquid restaking tokens, which were whitelisted across major lending protocols due to their yield and growing share of Ethereum's locked value, did not account for a scenario where the collateral would become 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 faces contagion risk, it reveals the fragility of the entire system.' The current token price reflects concerns about whether the Umbrella reserve is sufficient to cover the resulting hole and whether stkAAVE holders backing that reserve will bear the loss.