Aave Faces Potential $230 Million Loss Following Kelp DAO Bridge Exploit

A recent 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 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 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 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, exposing Aave to potentially impaired collateral. 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 how Kelp handles the shortfall. If losses are spread across all rsETH holders, the token may 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 could be more severe, with bad debt potentially 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. Although LayerZero itself was not directly hacked, its messaging layer exposed flawed assumptions in Kelp's validation of cross-chain data. 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 from the platform. The episode highlights Aave's indirect exposure 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. With the DAO treasury holding approximately $181 million in assets, discussions are underway with ecosystem participants to address potential losses, and Kelp has not yet outlined its plan for allocating losses, leaving Aave's ultimate exposure uncertain as the situation continues to unfold.