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

A recent bridge exploit targeting Kelp DAO and LayerZero has put lending protocol Aave at risk of incurring significant losses, potentially up to $230 million, depending on 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 exploited this setup by creating a forged transfer message, resulting in the creation of new tokens without backing, and subsequently releasing 116,500 rsETH from the Ethereum-side bridge. Instead of selling the assets, 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 potentially impaired collateral. Aave Labs quickly 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 Kelp's handling of the shortfall. If losses are spread across all rsETH holders, the token may face a 15% depegging, resulting in around $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 approximately $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. The incident has raised concerns about the mispricing of collateral and the risk of undercollateralized loans, prompting users to reduce their exposure and withdraw around $6 billion in total value locked from Aave. The episode highlights Aave's indirect exposure 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. Aave's DAO treasury holds approximately $181 million in assets, and discussions are underway to address potential losses, with Kelp's plan for allocating losses still uncertain.