Over 400 JavaScript packages compromised by Shai Hulud malware, raising urgent security concerns for crypto developers


A new NPM supply-chain attack has targeted hundreds of JavaScript packages, including at least 10 widely used in the cryptocurrency ecosystem, notably those linked to Ethereum Name Service (ENS). The malware, dubbed Shai Hulud, is a self-replicating worm capable of stealing credentials from infected developer environments, intensifying concerns about crypto software security.


Scope of the Attack

Cybersecurity researcher Charlie Eriksen of Aikido Security identified over 400 infected NPM packages, validating each to avoid false positives. The affected libraries include high-download packages such as ENS’s content-hash (36,000 weekly downloads) and address-encoder (37,500 weekly downloads), along with ensjs, ens-validation, ethereum-ens, and ens-contracts. Non-crypto packages, including tools from automation platform Zapier, were also compromised, some exceeding 1.5 million weekly downloads.

Eriksen warned that “the scope of this new Shai Hulud attack is frankly massive; we’re still working through the queue to confirm it all. It’ll make the previous attack look like nothing.”

Shai Hulud is distinct from previous crypto-targeted attacks because it steals credentials rather than directly stealing cryptocurrency, potentially compromising wallet keys and other sensitive developer secrets.


Implications for the Crypto Ecosystem

Packages linked to ENS, a human-readable address service for Ethereum, are heavily relied upon in multiple projects. For example, content-hash alone has 91 dependent packages, highlighting the risk of cascading impacts across the ecosystem. Cryptocurrency projects and developers relying on these libraries may face operational and security risks if the malware spreads unchecked.

Cybersecurity firm Wiz reported spotting over 25,000 affected repositories across ~350 unique users, with 1,000 new repositories being added every 30 minutes. The firm emphasized the need for immediate investigation and remediation in any environment using NPM.


The Shai Hulud attack underscores the growing threat of supply-chain malware in crypto and software development. Developers are urged to audit dependencies, rotate credentials, and implement automated security monitoring to mitigate risk. With both ENS-related and widely used general packages affected, the incident highlights the critical importance of supply-chain security in protecting developer infrastructure and digital assets.

Disclaimer

This content is for informational purposes only and does not constitute financial, investment, or legal advice. Cryptocurrency trading involves risk and may result in financial loss.

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