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

A devastating bridge exploit involving Kelp DAO and LayerZero has put lending protocol Aave at risk of incurring losses of up to $230 million, contingent upon the resolution of the situation. According to a report published by Aave Labs and service provider LlamaRisk on the Aave governance forum, the incident centers on 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 exploited 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 deposited 89,567 rsETH into Aave as collateral and borrowed approximately $190 million in ETH and related assets across Ethereum and Arbitrum. Aave Labs quickly 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 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 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. The incident has raised concerns about the safety of interconnected DeFi infrastructure, with around $6 billion in total value locked being withdrawn from Aave following the incident. The report states that the DAO treasury holds approximately $181 million in assets, and discussions are underway with ecosystem participants to address potential losses. Kelp has not yet outlined its plan for allocating losses, leaving Aave's ultimate exposure uncertain as the situation continues to unfold.