Aave Faces Potential Losses of Up to $230 Million Following Kelp DAO Bridge Exploit

A recent exploit of the Kelp DAO and LayerZero bridge has put lending protocol Aave at risk of incurring significant losses, potentially up to $230 million, contingent upon the resolution of the situation. According to a report by Aave Labs and LlamaRisk, the incident revolves around rsETH, a liquid restaking token issued by KelpDAO, which relies on a bridge mechanism to transfer tokens between blockchains. An attacker manipulated this setup by creating a forged transfer message that appeared legitimate, resulting in the system approving the transfer without the tokens being removed from the sending chain. This led to the creation of new tokens without backing, with 116,500 rsETH being released from the Ethereum-side bridge. Instead of selling the assets on the open market, the attacker used 89,567 rsETH as collateral to borrow approximately $190 million in ETH and related assets across Ethereum and Arbitrum, leaving Aave vulnerable to collateral with potentially impaired backing. In response, Aave Labs swiftly took action to mitigate the risk by freezing rsETH markets, setting loan-to-value ratios to zero, and halting new borrowing against the asset. The outcome now largely depends on how Kelp handles the shortfall. If losses are distributed across all rsETH holders, the token may experience an estimated 15% depegging, resulting in around $124 million in bad debt for Aave. However, if losses are confined to Layer 2 networks, the impact could be more severe, with bad debt potentially rising to approximately $230 million and concentrated on networks like Arbitrum and Mantle. The exploit was made possible by weaknesses in Kelp's verification process for cross-chain messages using LayerZero, allowing the attacker to make certain assets appear fully backed when they were not. This incident has raised concerns about the potential for mispriced or undercollateralized loans and has prompted users to reduce their exposure, resulting in the withdrawal of around $6 billion in total value locked from Aave. The episode highlights the indirect exposure of Aave to external systems, with increased collateral risk, pressure on lending positions, and a decline in deposits as users reassess the safety of interconnected DeFi infrastructure. Discussions are underway with ecosystem participants to address potential losses, with Kelp's DAO treasury holding approximately $181 million in assets.