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

Aave has witnessed a staggering $6.6 billion exodus, not due to a direct hack, but as a result of a catastrophic event involving Kelp's bridge. 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 amidst a flurry of liquidations over the weekend. Depositors are fleeing because Aave has been left carrying a massive hole, not of its own making. When attackers drained 116,500 rsETH from Kelp's bridge on Saturday, they promptly dumped the stolen tokens on Aave V3 as collateral and borrowed 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 totaling approximately $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 already-staked ether on Ethereum and channels 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 about $292 million, to an address they controlled. They then deposited this 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 softened to 'exploring paths to offset the deficit.' The concentration of damage on Aave can be attributed to its loan book, which spans 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 major lending protocols due to their yield and representation of 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 would plummet to zero because a bridge on an unrelated chain was exploited. According to trader Altcoin Sherpa, 'AAVE is the backbone of DeFi, with billions invested, and pretty much 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 hole and whether stkAAVE holders who back that reserve will bear the loss.