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

A devastating exploit of the Kelp DAO and LayerZero bridge has put Aave, a lending protocol, at risk of incurring significant losses of 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. The protocol utilizes a bridge mechanism to transfer rsETH between blockchains, locking tokens on one chain while issuing corresponding tokens on another. An attacker manipulated this setup by forging a valid transfer message, resulting in the creation of new, unbacked tokens and the release of 116,500 rsETH from the Ethereum-side bridge. Instead of selling these assets on the open market, the attacker deposited 89,567 rsETH into Aave as collateral and borrowed approximately $190 million in ETH and related assets across Ethereum and Arbitrum. This has left Aave vulnerable to collateral with potentially impaired backing. Aave Labs swiftly responded to contain the risk by freezing rsETH markets, setting loan-to-value ratios to zero, and halting new borrowing against the asset. The outcome is now largely dependent on how Kelp handles the shortfall. If losses are spread across all rsETH holders, the token would experience an estimated 15% depegging, resulting in approximately $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 and concentrated on networks such as 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. This incident has raised concerns about the mispricing or lack of full backing of certain assets on Aave, increasing the risk of undercollateralized loans. In response, users have moved to reduce their exposure, resulting in the withdrawal of around $6 billion in total value locked from Aave. The episode highlights Aave's indirect exposure to external systems, with the impact felt through increased collateral risk, pressure on lending positions, and a sharp decline in deposits as users reassess the safety of interconnected DeFi infrastructure. The report notes that the DAO treasury holds approximately $181 million in assets and that discussions are underway with ecosystem participants to address potential losses. However, Kelp has yet to outline its plan for allocating losses, leaving Aave's ultimate exposure uncertain as the situation continues to unfold.