Malware in base65-85x
The npm package base65-85x was found to contain malware, potentially giving full control of affected systems to an outside entity. All systems with this package installed should be considered fully compromised.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- base65-85x
The npm package base65-85x was identified as containing malware. According to the GitHub Security Advisory (GHSA-mv5w-mcrv-wmx9), 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 initial compromise, given the potential for full system access by the attacker.\n\nUsers should treat any system that has run this package as potentially fully compromised and take appropriate incident response measures.
Indicators of compromise
- Packages
- base65-85x
Remediation
- Immediately remove the base65-85x package from all systems
- Rotate all secrets, API keys, and credentials from a different, uncompromised computer
- Perform a full security audit and malware scan of affected systems
- Consider the affected system(s) as potentially fully compromised and plan for complete rebuild if critical
- Review access logs and monitor for unauthorized activity on systems that had this package installed
Sources
- GitHub Advisory GHSA-mv5w-mcrv-wmx9 · GitHub Advisory Database
Cite this entry
"Malware in base65-85x." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 23, 2026; last updated July 23, 2026. https://supplychainattack.org/incident/malware-in-base65-85x-9fwizz
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