Hackers compromised the code behind a crypto protocol used by multiple web3 applications and services, the software maker Ledger said on Thursday. Ledger, a company that makes a widely used and popular crypto hardware and software wallet, among other products, announced on X (previously Twitter) that someone had pushed out a “malicious version” of its Ledger Connect Kit, a library that decentralized apps (dApps) made by other companies and projects use to connect to the Ledger wallet service. “A genuine version is being pushed to replace the malicious file now. Do not interact with any dApps for the moment. We will keep you informed as the situation evolves,” Ledger wrote. Soon after, Ledger posted an update saying that the hackers had replaced the genuine version of its software some six hours earlier, and that the company was investigating the incident and would…

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That would allow the hackers to drain the crypto inside users’ wallets — so long as the users accepted the push to connect their wallets to the malicious Ledger version.

It’s not immediately clear how many people fell victim to the hack. ZachXBT, a well-known independent crypto researcher, wrote on X that one victim had more than $600,000 in crypto drained from their account.

Several blockchain security researchers, as well as people who work in the web3 industry, warned users on social media of the supply chain hack against Ledger.

Matthew Lilley, the chief technology officer of cryptocurrency trading platform Sushi, was one of the first ones to detect the attack and share the news.

“I would recommend never interacting with a [decentralized app] ever again and honestly just move on with your life,” said Joseph Delong, the CTO of NFT lending platform AstariaXYZ, joked on X, referring to the fact that Ledger uses the notoriously insecure programming language Java.

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