Malware in sjs-builder
The npm package sjs-builder contained malware that provided full system compromise to attackers. Any computer with this package installed or running should be considered fully compromised and all secrets rotated from a different machine.
- Disclosed
- Last updated
- Blast radius
- Any system with sjs-builder installed or executed
- Ecosystems
- Attack vectors
- Affected entities
- sjs-buildernpm package
The npm package sjs-builder was found to contain malware. According to the GitHub Advisory (GHSA-27jm-f99f-wqr4), installation or execution of this package results in full system compromise.\n\nAny computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on affected computers should be rotated immediately from a different, unaffected computer.\n\nWhile the package should be removed, complete removal of all malicious software cannot be guaranteed due to the level of system access granted to the attacker through this malware.\n\nThe advisory was published on 2026-07-06 via the GitHub Advisory Database.
Indicators of compromise
- Packages
- sjs-builder
Remediation
- Immediately remove the sjs-builder package from all systems
- Rotate all secrets, API keys, credentials, and signing keys from a different, unaffected computer
- Assume full system compromise and conduct forensic analysis
- Review system logs and network traffic for signs of unauthorized access or data exfiltration
- Consider rebuilding affected systems from clean media if possible
- Monitor for any indicators of compromise or persistence mechanisms
Sources
- GitHub Advisory GHSA-27jm-f99f-wqr4 · GitHub Advisory Database
Cite this entry
"Malware in sjs-builder." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 6, 2026; last updated July 6, 2026. https://supplychainattack.org/incident/malware-in-sjs-builder-ciu59n
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