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 incurring significant losses, potentially amounting to $230 million, contingent upon the resolution of the situation. The incident, as detailed in a report by Aave Labs and LlamaRisk on the Aave governance forum, 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, leaving Aave vulnerable to collateral with potentially impaired backing. Aave Labs swiftly 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 may face a 15% depegging, resulting in approximately $124 million in bad debt for Aave. However, if losses are isolated to Layer 2 networks, the impact could be more severe, with bad debt rising to around $230 million, primarily affecting networks like Arbitrum and Mantle. The exploit stemmed from weaknesses in Kelp's verification of cross-chain messages using LayerZero, allowing the attacker to manipulate the process and extract value from the system. Although LayerZero itself was not directly hacked, its messaging layer exposed flawed assumptions in Kelp's validation of cross-chain data. The incident raised concerns about the potential for mispriced or under-backed collateral, increasing the risk of undercollateralized loans. In response, users withdrew around $6 billion in total value locked from Aave, reflecting a broad pullback as participants reacted to the uncertainty. The episode highlighted Aave's indirect exposure to external systems, resulting in increased collateral risk, pressure on lending positions, and a sharp decline in deposits as users reassessed the safety of interconnected DeFi infrastructure. The report noted that the DAO treasury holds approximately $181 million in assets, and discussions are underway with ecosystem participants to address potential losses. However, Kelp has not yet outlined its plan for allocating losses, leaving Aave's ultimate exposure uncertain as the situation continues to unfold.