Malware in class-synth
The npm package class-synth was found to contain malware, resulting in full system compromise of any computer with the package installed or running. GitHub Security Advisory GHSA-c6cg-h94m-mv67 was published on 2026-07-14.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- class-synth
The npm package class-synth was identified as containing malware. According to the GitHub Security Advisory, 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\nThis is classified as a critical-severity supply chain attack due to the complete system compromise potential and the need for comprehensive remediation beyond simple package removal.
Indicators of compromise
- Packages
- class-synth
Remediation
- Immediately isolate any computer that has class-synth installed or running from the network
- Rotate all secrets, API keys, credentials, and cryptographic keys from a different, uncompromised computer
- Remove the class-synth package from the affected system
- Perform a comprehensive security audit and malware scan of the affected system
- Consider full system reimaging or replacement if complete compromise is suspected
- Review access logs and audit trails for any unauthorized activity during the period the package was installed
- Notify any systems or services that may have been accessed from the compromised computer
Sources
- GitHub Advisory GHSA-c6cg-h94m-mv67 · GitHub Advisory Database
Cite this entry
"Malware in class-synth." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 14, 2026; last updated July 14, 2026. https://supplychainattack.org/incident/malware-in-class-synth-1vdhcy
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