Malware in postcss-selector-minify
Malware was discovered in the npm package postcss-selector-minify. Systems with this package installed are considered fully compromised and require immediate remediation.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- postcss-selector-minify
A malware incident was identified in the npm package postcss-selector-minify. According to the GitHub Advisory (GHSA-pjfj-gp2h-5692), any computer 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, as the attacker may have gained full control of the system.\n\nAffected users should treat this as a critical security incident requiring comprehensive system remediation and credential rotation.
Indicators of compromise
- Packages
- postcss-selector-minify
Remediation
- Immediately isolate affected systems from the network
- Rotate all secrets, API keys, and credentials from a different, uncompromised computer
- Remove the postcss-selector-minify package
- Perform a comprehensive security audit and malware scan of affected systems
- Review system logs and access logs for signs of unauthorized activity
- Consider full system reimaging if the system handles sensitive data or credentials
Sources
- GitHub Advisory GHSA-pjfj-gp2h-5692 · GitHub Advisory Database
Cite this entry
"Malware in postcss-selector-minify." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 20, 2026; last updated August 20, 2026. https://supplychainattack.org/incident/malware-in-postcss-selector-minify-1yii9l
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