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

Aave witnessed a staggering $6.6 billion exodus, not due to a direct hack on the platform. The protocol's total value locked plummeted from $26.4 billion on April 18 to nearly $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 as Aave grapples with a hole it did not create. Attackers drained 116,500 rsETH from Kelp's bridge on Saturday, utilizing 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 nearing $236 million. Aave, the largest DeFi lending protocol, 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. This rsETH is what users trade and, crucially, what some users posted as collateral on Aave to borrow against. On Saturday, attackers tricked 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, 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 damage is attributed to Aave's loan book, which spans 22 chains but has $14.24 billion of the $17.82 billion in outstanding borrows tied to Ethereum alone. WETH accounts for 39.49% of all loans on the protocol, making it the dominant collateral-to-WETH pair. 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 its 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 growing share of Ethereum's locked value. Risk models priced them as if they would hold peg under normal conditions but did not account for a scenario where the collateral becomes worthless due to a bridge exploit on an unrelated chain. Trader Altcoin Sherpa noted on X, 'AAVE is the backbone of DeFi, with billions invested, and most 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 now reflects concerns over whether Umbrella is sufficient to cover the hole and whether stkAAVE holders backing the reserve will absorb the loss.