Malware in postcss-minify-selector-parser
Malware was discovered in the npm package postcss-minify-selector-parser. 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-minify-selector-parser
A critical malware incident was identified in the npm package postcss-minify-selector-parser. According to the GitHub advisory, 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.\n\nThis represents a severe supply chain attack affecting the npm ecosystem through a compromised package.
Indicators of compromise
- Packages
- postcss-minify-selector-parser
Remediation
- Immediately rotate all secrets and keys from a different, uncompromised computer
- Remove the postcss-minify-selector-parser package from all affected systems
- Conduct a full security audit of any system that had this package installed
- Review system logs for suspicious activity during the period the package was installed
- Consider the affected system(s) as potentially fully compromised and plan for complete rebuild if critical systems are involved
Sources
- GitHub Advisory GHSA-3m8w-m4vc-8f58 · GitHub Advisory Database
Cite this entry
"Malware in postcss-minify-selector-parser." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 24, 2026; last updated June 24, 2026. https://supplychainattack.org/incident/malware-in-postcss-minify-selector-parser-ksxflp
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