Malware in @siwatfa/yorn
Malware was discovered in the npm package @siwatfa/yorn. Systems with this package installed or running should be considered fully compromised, with all secrets and keys requiring immediate rotation from a different computer.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- @siwatfa/yorn
A malware-laden version of the npm package @siwatfa/yorn was published and made available to users. The advisory indicates that any computer with this package installed or running should be considered fully compromised, suggesting the malware grants broad system access to an outside entity.
Immediate remediation requires rotating all secrets and keys from a different, uncompromised computer. While the package should be removed, the advisory notes that full system compromise may mean removing the package alone is insufficient to eliminate all malicious software that may have been installed as a result.
The incident was disclosed via GitHub Advisory GHSA-3rxm-r82c-h2f9 on 2026-08-17.
Indicators of compromise
- Packages
- @siwatfa/yorn
Remediation
- Immediately rotate all secrets, keys, and credentials from a different, uncompromised computer
- Remove the @siwatfa/yorn package from all affected systems
- Perform a full security audit and malware scan of any system that had this package installed
- Review system logs and network activity for signs of unauthorized access or data exfiltration
- Consider full system reimaging if compromise is suspected
Sources
- GitHub Advisory GHSA-3rxm-r82c-h2f9 · GitHub Advisory Database
Cite this entry
"Malware in @siwatfa/yorn." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 17, 2026; last updated August 17, 2026. https://supplychainattack.org/incident/malware-in-siwatfa-yorn-11eg14
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