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Packagist package.json hook supply chain attack campaign

Campaign
First reported
Last updated
Happening score
H score 39
1 unique sources, 1 articles

Summary

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A coordinated supply chain attack campaign compromised eight Packagist packages, creating repeat execution risk for projects that install the affected versions. The malicious code hid in package.json lifecycle hooks rather than composer metadata, which could evade PHP-focused review. The installer then fetched a Linux binary from GitHub Releases, saved it as /tmp/.sshd, and ran it in the background.

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Incident
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Timeline

  1. 23.05.2026 19:07 2 articles · 1mo ago

    Packagist supply chain campaign disclosed

    Initial Disclosure

    A coordinated supply chain campaign targeted eight Packagist packages by placing malicious code in package.json lifecycle hooks instead of composer.json, using postinstall scripts to download a Linux binary from a GitHub Releases URL, save it as /tmp/.sshd, grant execute permissions, and run it in the background. The affected packages were later removed from Packagist, and related references to the same payload were also found across 777 GitHub files and in at least two GitHub Actions workflows, indicating broader reuse of the malicious installer.

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