Aave Faces Potential $230 Million Loss Following Kelp DAO Bridge Exploit

A recent exploit of the Kelp DAO and LayerZero bridge has put lending protocol Aave at risk of losing up to $230 million, with the final outcome contingent upon the resolution of the situation. According to a report published by Aave Labs and LlamaRisk on the Aave governance forum, the incident centers on rsETH, a liquid restaking token issued by KelpDAO, which relies on a bridge mechanism to transfer tokens between blockchains. The attacker manipulated this setup by creating a forged transfer message, resulting in the creation of new tokens without backing, and 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 exposed to potentially impaired collateral. Aave Labs swiftly contained 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, with two possible scenarios: if losses are spread across all rsETH holders, the token would face an estimated 15% depegging, resulting in around $124 million in bad debt for Aave, or if losses are isolated to Layer 2 networks, the impact would be more severe, with bad debt rising to approximately $230 million. 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 extract value from the system. The incident has raised concerns about the safety of interconnected DeFi infrastructure and the potential for undercollateralized loans, prompting users to withdraw around $6 billion in total value locked from Aave. The report highlights Aave's indirect exposure to external systems, with discussions underway with ecosystem participants to address potential losses, and the DAO treasury holding approximately $181 million in assets.