Malware in assertcoreutils
Malware discovered in the npm package assertcoreutils. Systems with this package installed or running should be considered fully compromised.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- assertcoreutils
The npm package assertcoreutils has been identified as containing malware. According to the GitHub advisory (GHSA-22qr-5q9r-7v6x), any computer with this package installed or running should be considered fully compromised.\n\nImmediate remediation is required: all secrets and keys stored on affected computers should be rotated 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 package installation, as the attacker may have gained full control of the system.\n\nThis is a critical supply chain incident affecting the npm ecosystem.
Indicators of compromise
- Packages
- assertcoreutils
Remediation
- Immediately isolate any system with assertcoreutils installed from the network
- Rotate all secrets, API keys, and credentials from a different, uncompromised computer
- Remove the assertcoreutils package from all systems
- Perform a full security audit and malware scan of affected systems
- Review system logs and network traffic for signs of compromise or data exfiltration
- Consider the affected system(s) as potentially fully compromised and plan for complete rebuild if critical systems are involved
Sources
- GitHub Advisory GHSA-22qr-5q9r-7v6x · GitHub Advisory Database
Cite this entry
"Malware in assertcoreutils." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 14, 2026; last updated July 15, 2026. https://supplychainattack.org/incident/malware-in-assertcoreutils-4a1no4
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