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 losing up to $230 million, depending on the resolution of the situation. According to a report by Aave Labs and LlamaRisk, 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 manipulated this setup by creating a forged transfer message, resulting in the approval of a transfer without the actual movement of tokens, effectively creating new tokens without backing and releasing 116,500 rsETH from the Ethereum-side bridge. Instead of selling the assets, the attacker used 89,567 rsETH as collateral to borrow approximately $190 million in ETH and related assets on Aave, exposing the protocol to potentially impaired collateral. Aave Labs quickly contained 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 Kelp's handling of the shortfall, with estimated losses ranging from $124 million if spread across all rsETH holders to $230 million if isolated to Layer 2 networks. The exploit was made possible by 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 potential for mispriced or undercollateralized loans on Aave, prompting users to reduce their exposure and withdraw around $6 billion in total value locked. The episode highlights Aave's indirect exposure to external systems, with increased collateral risk, pressure on lending positions, and a decline in deposits as users reassess the safety of interconnected DeFi infrastructure. Discussions are underway to address potential losses, with Aave's ultimate exposure uncertain as the situation continues to evolve.