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

A recent bridge exploit involving Kelp DAO and LayerZero has left Aave, a lending protocol, vulnerable to potential 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, which relies on a bridge mechanism to transfer tokens between blockchains. An attacker exploited this setup by forging a valid transfer message, resulting in the creation of new tokens without backing, and releasing 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. Aave Labs promptly responded by freezing rsETH markets, setting loan-to-value ratios to zero, and halting new borrowing against the asset. The outcome now largely depends on Kelp's handling of 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 confined to Layer 2 networks, the impact would be more severe, with bad debt rising to approximately $230 million, primarily affecting networks such as Arbitrum and Mantle. The exploit stemmed from weaknesses in Kelp's cross-chain message verification process using LayerZero, allowing the attacker to manipulate the system and extract value. The incident has raised concerns about the safety of interconnected DeFi infrastructure, with around $6 billion in total value locked withdrawn from Aave following the incident. Aave's report states that its DAO treasury holds approximately $181 million in assets, and discussions are underway with ecosystem participants to address potential losses. The ultimate exposure for Aave remains uncertain as the situation continues to unfold.