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 incurring significant losses, potentially reaching $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 took advantage of 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 deposited 89,567 rsETH into Aave as collateral and borrowed approximately $190 million in ETH and related assets across Ethereum and Arbitrum, leaving Aave exposed to collateral with potentially impaired backing. Aave Labs promptly took action to contain the risk, freezing rsETH markets, setting loan-to-value ratios to zero, and halting new borrowing against the asset within hours. The outcome now largely depends on how Kelp handles the shortfall. If losses are spread 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 isolated to Layer 2 networks, the impact would be more severe, with bad debt rising to approximately $230 million and concentrated on networks such as Arbitrum and Mantle. The exploit stemmed from weaknesses in Kelp's verification process for 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 potential for undercollateralized loans and has led to a significant withdrawal of around $6 billion in total value locked from Aave. The episode highlights the indirect exposure of Aave 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 the report stating that the DAO treasury holds approximately $181 million in assets. However, Kelp has not yet outlined its plan for allocating losses, leaving Aave's ultimate exposure uncertain as the situation continues to evolve.