Malware in check-ulid
The npm package check-ulid was compromised and contains malware. 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
- check-ulid
The npm package check-ulid has been identified as containing malware. According to the GitHub advisory, any computer with this package installed or running should be considered fully compromised.
The advisory recommends immediate action: all secrets and keys stored on affected computers should be rotated from a different, uncompromised system. The package should be removed, though there is no guarantee that removal will eliminate all malicious software that may have been installed as a result of the compromise.
This represents a critical supply chain attack affecting all users of the check-ulid package.
Indicators of compromise
- Packages
- check-ulid
Remediation
- Immediately remove the check-ulid package from all systems
- Rotate all secrets, API keys, and credentials from a different, uncompromised computer
- Audit system logs for unauthorized access or activity
- Consider the affected system(s) as potentially fully compromised and plan for complete rebuild if critical systems are involved
- Check for any other malicious packages or software that may have been installed
Sources
- GitHub Advisory GHSA-266v-958f-g596 · GitHub Advisory Database
Cite this entry
"Malware in check-ulid." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 16, 2026; last updated June 16, 2026. https://supplychainattack.org/incident/malware-in-check-ulid-1oxeek
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