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"Sha1-Hulud: The Preinstall Worm That Hijacked 26,000 Repos"

An npm worm exploited preinstall hooks to compromise 26,000 repositories, stealing credentials and spreading before security scans could detect it. The attack used the install command to execute malicious code during package downloads. Review this page to learn how verifiable source-based builds can prevent registry-based supply chain attacks.

Software supply chain attacks are becoming more advanced, with malware executing before traditional security scans detect it. The Sha1-Hulud worm highlights this evolution, exploiting a blind spot in package installation workflows.

This page examines how Sha1-Hulud weaponized npm's preinstall hooks to compromise 26,000+ repositories in 72 hours, and explores prevention strategies addressing root causes:

· Worm replication via stolen credentials and infected package republishing
· A blast radius impacting 500+ packages with 132M+ downloads
· A build method bypassing compromised registries by sourcing verified code

Learn how this attack unfolded and defenses against similar threats.

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