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 Aave, a lending protocol, at risk of losing up to $230 million, contingent upon the resolution of the situation. According to a report published on the Aave governance forum 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 took advantage of this setup by creating a fake transfer message that appeared legitimate, resulting in the system approving the transfer without the tokens being removed from the sending chain, effectively creating new tokens without backing and releasing 116,500 rsETH 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 significant impairment. Aave Labs promptly responded 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 spread across all rsETH holders, the token would experience an estimated 15% depegging, resulting in around $124 million in bad debt for Aave. However, if losses are isolated to Layer 2 networks, the impact would be more severe, with bad debt rising to roughly $230 million, primarily affecting networks such as Arbitrum and Mantle. The exploit was made possible by weaknesses in Kelp's verification of cross-chain messages using LayerZero, allowing the attacker to manipulate the process and make certain assets appear fully backed when they were not. This incident has raised concerns about the potential for mispriced or undercollateralized loans on Aave, prompting users to reduce their exposure and withdraw around $6 billion in total value locked from the platform. The episode highlights Aave's indirect exposure to external systems, resulting in increased collateral risk, pressure on lending positions, and a decline in deposits as users reassess the safety of interconnected DeFi infrastructure. Aave's DAO treasury currently holds approximately $181 million in assets, and discussions are underway with ecosystem participants to address potential losses. However, Kelp has not yet announced its plan for allocating losses, leaving Aave's ultimate exposure uncertain as the situation continues to unfold.