Malware in assertcore
The npm package assertcore was found to contain malware, potentially giving attackers full control of affected systems. All systems with this package installed should be considered compromised and require immediate remediation.
- Disclosed
- Last updated
- Blast radius
- Any system with assertcore installed or running
- Ecosystems
- Attack vectors
- Affected entities
- assertcorenpm package containing malware
The npm package assertcore was identified as containing malware. According to the GitHub Advisory (GHSA-8f9p-rcjg-hhx4), any computer with this package installed or running should be considered fully compromised.\n\nThe advisory indicates that attackers may have gained full control of affected systems. All secrets and keys stored on compromised computers should be rotated immediately from a different, unaffected 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 initial compromise.\n\nThis represents a critical supply chain attack through a malicious npm package with potentially severe impact on all systems where it was deployed.
Indicators of compromise
- Packages
- assertcore
Remediation
- Immediately isolate any system with assertcore installed from the network
- Rotate all secrets, API keys, and credentials from a different, unaffected computer
- Remove the assertcore package from all affected systems
- Conduct a full forensic analysis of affected systems to identify any additional malware or persistence mechanisms
- Review system logs and network traffic for signs of unauthorized access or data exfiltration
- Consider full system reimaging if compromise is confirmed
- Audit all systems that may have been accessed using credentials stored on compromised machines
Sources
- GitHub Advisory GHSA-8f9p-rcjg-hhx4 · GitHub Advisory Database
Cite this entry
"Malware in assertcore." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 14, 2026; last updated July 15, 2026. https://supplychainattack.org/incident/malware-in-assertcore-1alqmr
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