Malware in @onereach/postcss-scoped-selector
The npm package @onereach/postcss-scoped-selector contained malware that provided full system compromise to attackers. All affected systems should be considered fully compromised and all secrets rotated from a clean machine.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed
- Ecosystems
- Attack vectors
- Affected entities
- @onereach/postcss-scoped-selector
The npm package @onereach/postcss-scoped-selector was found to contain malware. According to the GitHub Security Advisory (GHSA-63qv-h2r7-8vxg), any computer with this package installed or running should be considered fully compromised.\n\nThe advisory recommends immediate rotation of all secrets and keys stored on affected computers from a different, uncompromised machine. While the malicious 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 initial compromise, given that the attacker may have gained full control of the system.\n\nAffected users should treat this as a critical incident requiring comprehensive system remediation and credential rotation.
Indicators of compromise
- Packages
- @onereach/postcss-scoped-selector
Remediation
- Immediately rotate all secrets, API keys, and credentials from a clean, uncompromised computer
- Remove the @onereach/postcss-scoped-selector package from all affected systems
- Perform a comprehensive security audit and malware scan of all affected systems
- Review system logs and network traffic for signs of unauthorized access or data exfiltration
- Consider full system reimaging if the package was installed on production or sensitive systems
- Audit all systems that may have been accessed from compromised machines
Sources
- GitHub Advisory GHSA-63qv-h2r7-8vxg · GitHub Advisory Database
Cite this entry
"Malware in @onereach/postcss-scoped-selector." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 4, 2026; last updated August 4, 2026. https://supplychainattack.org/incident/malware-in-onereach-postcss-scoped-selector-en664n
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