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Malware in postcss-property-rollup

Malware was discovered in the npm package postcss-property-rollup. The package is considered to provide full system compromise to any computer where it is installed or running.

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Disclosed
Last updated
Blast radius
Any system with the package installed or running
Ecosystems
Attack vectors
Affected entities
  • postcss-property-rollup

A malware incident was identified in the npm package postcss-property-rollup. According to the GitHub Advisory (GHSA-6g2x-2f5c-wp9w), any computer that has this package installed or running should be considered fully compromised.\n\nThe advisory recommends that all secrets and keys stored on affected computers be rotated immediately from a different, uncompromised system. While the package should be removed, the advisory notes that full control of the computer may have been given to an outside entity, meaning removal of the package alone may not eliminate all malicious software that resulted from the installation.\n\nAffected users should treat their systems as potentially fully compromised and take appropriate incident response measures.

Indicators of compromise

Packages
  • postcss-property-rollup

Remediation

  • Remove the postcss-property-rollup package immediately
  • Rotate all secrets, keys, and credentials from a different, uncompromised computer
  • Assume full system compromise and conduct thorough forensic analysis
  • Consider the affected system potentially compromised beyond package removal
  • Review system logs and network activity for signs of unauthorized access or data exfiltration

Sources

  1. GitHub Advisory GHSA-6g2x-2f5c-wp9w · GitHub Advisory Database

Cite this entry

"Malware in postcss-property-rollup." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 30, 2026; last updated June 30, 2026. https://supplychainattack.org/incident/malware-in-postcss-property-rollup-v3pw5v

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