Malware in browserslist-db-sync
Malware was discovered in the npm package browserslist-db-sync, resulting in full system compromise for any computer with the package installed or running. All affected systems should be considered fully compromised and all secrets and keys rotated immediately from a different computer.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- browserslist-db-sync
A critical malware incident was identified in the npm package browserslist-db-sync. According to the GitHub Security Advisory (GHSA-mfw9-5hqc-vc53), 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 computer. While the package should be removed, the advisory notes that full control of the computer may have been given to an outside entity, meaning there is no guarantee that removing the package will remove all malicious software resulting from the installation.\n\nThis represents a severe supply chain attack through a compromised npm package with potential for widespread impact across development environments and production systems that may have adopted this dependency.
Indicators of compromise
- Packages
- browserslist-db-sync
Remediation
- Immediately remove the browserslist-db-sync package from all affected systems
- Rotate all secrets, API keys, credentials, and signing keys from a different, uncompromised computer
- Conduct a full security audit of any system that had this package installed
- Review all code commits and deployments made from affected systems for potential tampering
- Monitor affected systems for signs of persistent malware or backdoors
- Consider full system reimaging if the package was installed on critical infrastructure or systems with access to sensitive data
Sources
- GitHub Advisory GHSA-mfw9-5hqc-vc53 · GitHub Advisory Database
Cite this entry
"Malware in browserslist-db-sync." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 15, 2026; last updated June 16, 2026. https://supplychainattack.org/incident/malware-in-browserslist-db-sync-t8d42w
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