Malware in sass-format
The npm package sass-format was compromised and distributed with malware. Any system with the package installed or running should be considered fully compromised.
- Disclosed
- Last updated
- Blast radius
- Any system with sass-format installed or executed
- Ecosystems
- Attack vectors
- Affected entities
- sass-formatnpm package
The npm package sass-format was found to contain malware. According to the GitHub Advisory (GHSA-m8x4-pc4m-p5gv), any computer that has this package installed or running should be considered fully compromised.\n\nImmediate action is required: all secrets and keys stored on affected computers should be rotated immediately from a different, uncompromised system. The package should be removed, though full removal of all malicious software cannot be guaranteed given the level of system compromise.\n\nThis represents a critical supply chain attack through a compromised npm package with potential for complete system takeover.
Indicators of compromise
- Packages
- sass-format
Remediation
- Immediately rotate all secrets, API keys, and credentials from a different, uncompromised computer
- Remove the sass-format package from all affected systems
- Audit system logs and network traffic for signs of unauthorized access or data exfiltration
- Consider the affected system(s) as potentially fully compromised and plan for complete rebuild if handling sensitive data
- Check for any other suspicious packages or modifications on affected systems
Sources
- GitHub Advisory GHSA-m8x4-pc4m-p5gv · GitHub Advisory Database
Cite this entry
"Malware in sass-format." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 11, 2026; last updated June 11, 2026. https://supplychainattack.org/incident/malware-in-sass-format-jv8c46
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