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

Aave has experienced a massive exodus of $6.6 billion in deposits, but this is not a result of 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 saw 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 that Aave's borrow amount is roughly $196 million, with total positions across Aave, Compound, and Euler totaling around $236 million. Aave is the largest lending protocol in DeFi, where users deposit cryptocurrency to earn yield, and others borrow against collateral. Kelp is a liquid restaking protocol that takes already-staked ether on Ethereum and channels 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 deceived Kelp's cross-chain bridge into releasing 116,500 rsETH, worth approximately $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, explains why the damage is so significant. 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, 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. Depositors are at risk of losing their funds either way. Liquid restaking tokens were whitelisted across every major lending protocol due to their yield and growing share of Ethereum's locked value. Risk models priced them as if they would hold their peg under normal conditions, but none accounted for a scenario where the collateral becomes worthless due to a bridge exploit on a chain Aave does not control. According to trader Altcoin Sherpa, '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 has contagion risk, it reveals the fragility of the entire system.' The token price is now reflecting concerns over whether the Umbrella reserve is sufficient to cover the resulting hole and whether stkAAVE holders who back that reserve will absorb the loss.