Malware in sass-formats
Malware was discovered in the npm package sass-formats. The package is considered to provide full system compromise to any computer where it is installed or running.
- Disclosed
- Last updated
- Blast radius
- Any system with sass-formats installed or running
- Ecosystems
- Attack vectors
- Affected entities
- sass-formatsnpm package
A critical malware incident was identified in the npm package sass-formats. According to the GitHub Advisory (GHSA-pvrm-39m5-j3c4), any computer with 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 that resulted from the installation.\n\nThis represents a supply chain compromise of the npm ecosystem affecting the sass-formats package.
Indicators of compromise
- Packages
- sass-formats
Remediation
- Immediately isolate any computer that has sass-formats installed or running from the network
- Rotate all secrets, API keys, credentials, and signing keys from a different, uncompromised computer
- Remove the sass-formats package from all affected systems
- Perform a full security audit and malware scan of affected systems
- Review all access logs and activity on affected systems for signs of unauthorized access or data exfiltration
- Consider the affected systems as potentially fully compromised and plan for reimaging or replacement
Sources
- GitHub Advisory GHSA-pvrm-39m5-j3c4 · GitHub Advisory Database
Cite this entry
"Malware in sass-formats." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 11, 2026; last updated June 11, 2026. https://supplychainattack.org/incident/malware-in-sass-formats-1dfcgw
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