Malware in bign.tsm
The npm package bign.tsm was found to contain malware. Any computer with this package installed or running should be considered fully compromised, with all secrets and keys requiring immediate rotation from a different system.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- bign.tsmnpm package containing malware
The npm package bign.tsm was identified as containing malware and published as a critical security advisory on GitHub (GHSA-pwrg-56mj-pq64). The advisory indicates that any system with this package installed or running should be considered fully compromised.\n\nAccording to the advisory, all secrets and keys stored on affected computers should be rotated immediately from a different, uncompromised system. While the package should be removed, the advisory notes that full control of the computer may have been given to an outside entity, meaning removal of the package alone may not eliminate all malicious software that resulted from the installation.\n\nThis represents a critical supply chain compromise affecting npm users who installed or ran the bign.tsm package.
Indicators of compromise
- Packages
- bign.tsm
Remediation
- Remove the bign.tsm package immediately from all affected systems
- Rotate all secrets, keys, and credentials from a different, uncompromised computer
- Perform a full security audit and malware scan of any system that had the package installed or running
- Review system logs for any unauthorized access or activity during the period the package was installed
- Consider the affected system(s) as potentially fully compromised and plan for complete rebuild if critical systems are involved
Sources
- GitHub Advisory GHSA-pwrg-56mj-pq64 · GitHub Advisory Database
Cite this entry
"Malware in bign.tsm." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 16, 2026; last updated June 16, 2026. https://supplychainattack.org/incident/malware-in-bign-tsm-up4rxg
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