Malware in postcss-processor-utils
Malware discovered in the npm package postcss-processor-utils. The package grants full system compromise to attackers, requiring immediate removal and credential rotation from a clean system.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- postcss-processor-utils
A malicious version of the npm package postcss-processor-utils has been identified containing malware. According to the GitHub Advisory (GHSA-r5fg-j5cf-mfgx), any system with 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, there is no guarantee that removal will eliminate all malicious software that may have been installed as a result of the compromise.\n\nThe attack vector is a compromised package in the npm ecosystem, indicating the malware was injected into the package itself rather than through account takeover or other indirect means.
Indicators of compromise
- Packages
- postcss-processor-utils
Remediation
- Remove the postcss-processor-utils package immediately from all affected systems
- Rotate all secrets, API keys, and credentials from a clean, uncompromised computer
- Audit system logs for unauthorized access or activity during the period the package was installed
- Consider the affected system fully compromised and perform a complete security review
- Update any dependencies that relied on postcss-processor-utils to use alternative packages or patched versions
Sources
- GitHub Advisory GHSA-r5fg-j5cf-mfgx · GitHub Advisory Database
Cite this entry
"Malware in postcss-processor-utils." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 15, 2026; last updated July 15, 2026. https://supplychainattack.org/incident/malware-in-postcss-processor-utils-12hpd6
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