Malware in mjs-eslint-helper
The npm package mjs-eslint-helper contained malware that provided full system compromise to attackers. Any computer with this package installed should be considered fully compromised and all secrets and keys rotated immediately.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- mjs-eslint-helper
The npm package mjs-eslint-helper was found to contain malware. According to the GitHub Advisory (GHSA-qhjh-jf49-fm8p), any computer that has 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 computer. 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 that the attacker may have gained full control of the system.\n\nUsers should treat any system that installed or ran this package as potentially containing persistent malware and take appropriate incident response measures.
Indicators of compromise
- Packages
- mjs-eslint-helper
Remediation
- Immediately remove the mjs-eslint-helper package from all systems
- Rotate all secrets, API keys, and credentials from a clean, uncompromised computer
- Perform a full security audit and malware scan of any system that had this package installed
- Review system logs and network traffic for signs of unauthorized access or data exfiltration
- Consider the affected system(s) as potentially compromised and plan for full rebuild if critical infrastructure
- Monitor for any suspicious activity on accounts or systems that may have been exposed
Sources
- GitHub Advisory GHSA-qhjh-jf49-fm8p · GitHub Advisory Database
Cite this entry
"Malware in mjs-eslint-helper." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 23, 2026; last updated June 23, 2026. https://supplychainattack.org/incident/malware-in-mjs-eslint-helper-1h6gf1
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