Malware in ts-arithmetic-helper
Malware was discovered in the npm package ts-arithmetic-helper, resulting in full system compromise of any computer with the package installed or running. All secrets and keys on affected systems should be rotated immediately from a different computer.
- Disclosed
- Last updated
- Blast radius
- Any system with ts-arithmetic-helper installed or running
- Ecosystems
- Attack vectors
- Affected entities
- ts-arithmetic-helper
A critical malware incident was identified in the npm package ts-arithmetic-helper. According to the GitHub Advisory (GHSA-94cr-ccj8-78g6), 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 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 resulting from the installation.\n\nAffected users should treat their systems as potentially fully compromised and take comprehensive remediation steps beyond simple package removal.
Indicators of compromise
- Packages
- ts-arithmetic-helper
Remediation
- Immediately rotate all secrets and keys stored on affected computers from a different, uncompromised system
- Remove the ts-arithmetic-helper package from all affected systems
- Conduct a full security audit and malware scan of any system that had ts-arithmetic-helper installed
- Review system logs and network traffic for signs of unauthorized access or data exfiltration
- Consider full system reimaging if the system contained highly sensitive data or credentials
Sources
- GitHub Advisory GHSA-94cr-ccj8-78g6 · GitHub Advisory Database
Cite this entry
"Malware in ts-arithmetic-helper." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 23, 2026; last updated June 23, 2026. https://supplychainattack.org/incident/malware-in-ts-arithmetic-helper-qvlg2b
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