A recent $292 million exploit has sent shockwaves through the cryptocurrency industry, exposing weaknesses in decentralized finance (DeFi) infrastructure and sparking concerns about the potential for a ripple effect across lending protocols. Preliminary investigations suggest that the attack centered on Kelp's rsETH token, a yield-bearing version of ether (ETH), and the mechanism used to transfer assets between blockchains. The attacker appears to have manipulated the system to create a large number of tokens without proper collateral, then used them as collateral to borrow and drain real assets from lending markets, primarily from Aave, the largest decentralized crypto lender. This incident is the latest setback for DeFi, occurring just a couple of weeks after the $285 million exploit of Solana-based protocol Drift, which has further eroded investor trust in the nearly $90 billion crypto sector.
How the Attack Unfolded At a high level, the exploit targeted a LayerZero bridge component, a critical piece of infrastructure that enables assets to move across different blockchains, according to Charles Guillemet, CTO of hardware wallet maker Ledger. Bridges typically function by locking assets on one chain and minting equivalent tokens on another, a process that relies on a trusted entity, often referred to as an oracle or validator, to confirm deposits. In this case, Kelp effectively acted as the verifier. According to Guillemet, the system relied on a single-signer setup, meaning that only one entity could approve transactions.
"It appears that the attacker was able to sign a message, allowing them to mint a large amount of rsETH," he explained. However, it remains unclear how the attacker obtained this access. Michael Egorov, founder of Curve Finance, pointed to the same weakness in the system's configuration.
"When you trust a single party, things can go wrong, regardless of who that party is." This setup allowed the attacker to create unbacked tokens, even though no corresponding assets were locked on the source chain. Once minted, the tokens were quickly deployed. The attacker "immediately deposited them in lending protocols, mostly Aave, to borrow real ETH against," Guillemet explained. This maneuver transformed the problem from a single exploit into a broader market issue.
DeFi lending platforms are now left holding collateral that may be difficult to unwind, while valuable and liquid assets have already been drained. "Aave was left with rsETH, which cannot be sold, and max-borrowed ETH, so no one can withdraw ETH," Curve's Egorov said.
As a result, Aave and other lending protocols may be sitting on hundreds of millions of dollars in questionable collateral and bad debt, he warned, raising concerns about a potential "bank run" dynamic as users rush to withdraw funds. Aave saw a $6 billion drop in assets on the protocol as users pulled their assets following the incident. The token associated with the protocol was down about 15% over the past 24 hours of trading. Unanswered Questions Key questions remain about how the validator was compromised.
The system relied on LayerZero's official node, raising uncertainty over whether it was hacked, misconfigured, or misled. "Was it hacked? Was it fooled? We don't know," Egorov said.
The attacker's identity is also unknown, although Guillemet suggested that the scale of the attack implies a sophisticated actor. "Clearly, it was not some amateur hackers," he said. A Significant Blow to DeFi Trust Beyond the immediate losses, the exploit serves as another reminder that as DeFi grows more interconnected, failures in one layer can quickly cascade across the system.
Egorov argued that non-isolated lending models, where assets share risk across pools, amplify the impact of such events. He also pointed to shortcomings in how new assets are onboarded to lending platforms, saying configurations like Kelp's 1-of-1 verifier setup should have been flagged earlier. However, Egorov saw a silver lining. "The crypto environment is harsh, and no bank would have survived it, yet we are working with it.
I think DeFi will learn from this incident and become stronger than before." Still, even as incidents like this lead to protocol upgrades and redesigns, they also erode investor confidence in the broader DeFi sector. "All in all, the trust in DeFi protocols is eroded by this kind of event," Guillemet said. "And 2026 will most likely be the worst year in terms of hacks, again," he added.