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

A recent bridge exploit involving Kelp DAO and LayerZero has put lending protocol Aave at risk of losses amounting 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, which locks tokens on one chain and issues corresponding copies on another. An attacker manipulated this setup by creating a forged transfer message that appeared legitimate, resulting in the system approving the transfer despite the tokens never leaving the sending chain. This led to the creation of new tokens without backing, with 116,500 rsETH being released 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 moved to mitigate 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. If losses are distributed among all rsETH holders, the token may experience a 15% depegging, resulting in around $124 million in bad debt for Aave. However, if losses are confined to Layer 2 networks, the impact would be more severe, with bad debt rising to approximately $230 million and primarily affecting 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 system and extract value. Although LayerZero itself was not directly compromised, its messaging layer exposed flawed assumptions in Kelp's validation of cross-chain data. The incident raised concerns about the potential for undercollateralized loans, prompting users to reduce their exposure. Approximately $6 billion in total value locked was withdrawn from Aave following the incident, reflecting a broad pullback as participants reacted to the uncertainty.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 decline in deposits as users reassessed the safety of interconnected DeFi infrastructure. The report noted that Aave's DAO treasury holds around $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.