Malware in @jsimplify/errno
Malware discovered in the npm package @jsimplify/errno. 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
- @jsimplify/errno
A malware-laden version of the npm package @jsimplify/errno has been identified and published to the npm registry. Any computer with this package installed or running should be considered fully compromised.\n\nThe advisory indicates that the malicious package grants full control of affected systems to an outside entity. All secrets, keys, and credentials stored on compromised machines should be rotated immediately from a different, unaffected computer.\n\nWhile removing the package is necessary, there is no guarantee that removal will eliminate all malicious software that may have been installed as a result of the compromise. Full system remediation and security review is recommended.
Indicators of compromise
- Packages
- @jsimplify/errno
Remediation
- Immediately remove @jsimplify/errno from all systems
- Rotate all secrets, keys, and credentials from a different, unaffected computer
- Perform a full security audit and malware scan of affected systems
- Review system logs for unauthorized access or activity
- Consider full system rebuild if compromise is suspected to be deep
Sources
- GitHub Advisory GHSA-vgg6-7x38-g434 · GitHub Advisory Database
Cite this entry
"Malware in @jsimplify/errno." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 4, 2026; last updated August 4, 2026. https://supplychainattack.org/incident/malware-in-jsimplify-errno-17dhbm
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