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 losses totaling up to $230 million, contingent upon the resolution of the situation. According to a report published by Aave Labs and LlamaRisk on the Aave governance forum, 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, effectively creating new tokens without backing. This led to the release of 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, exposing Aave to collateral with potentially significant impairment. Aave Labs swiftly acted 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 would 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 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 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. 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. Discussions are underway with ecosystem participants to address potential losses, with Aave's ultimate exposure remaining uncertain as the situation continues to unfold.