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Malware in sjs-biginteger

Malware was discovered in the npm package sjs-biginteger. Systems with this package installed are considered fully compromised and require immediate remediation including secret rotation and package removal.

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Disclosed
Last updated
Blast radius
Any system with the malicious package installed
Ecosystems
Attack vectors
Affected entities
  • sjs-bigintegernpm package

The npm package sjs-biginteger was found to contain malware. According to the GitHub advisory (GHSA-38ww-f26r-f8w7), 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 malicious 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 compromise.\n\nThis incident was disclosed on 2026-07-06 via the GitHub advisory system.

Indicators of compromise

Packages
  • sjs-biginteger

Remediation

  • Immediately rotate all secrets and keys from a different, uncompromised computer
  • Remove the sjs-biginteger package from all affected systems
  • Audit system logs for unauthorized access or activity
  • Consider the affected system(s) as potentially fully compromised and plan for complete rebuild if critical systems are involved
  • Check for any other suspicious packages or modifications on affected systems

Sources

  1. GitHub Advisory GHSA-38ww-f26r-f8w7 · GitHub Advisory Database

Cite this entry

"Malware in sjs-biginteger." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 6, 2026; last updated July 6, 2026. https://supplychainattack.org/incident/malware-in-sjs-biginteger-1m079u

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