Malware in fastify-bundler
Malware was discovered in the npm package fastify-bundler, resulting in full system compromise for any installation. All affected systems should be considered fully compromised and all secrets rotated from a clean machine.
- Disclosed
- Last updated
- Blast radius
- Any system with fastify-bundler installed or running
- Ecosystems
- Attack vectors
- Affected entities
- fastify-bundlernpm package containing malware
A critical malware incident was identified in the npm package fastify-bundler. According to the GitHub Advisory (GHSA-f99h-9jhg-jrxw), any computer with this package installed or running should be considered fully compromised.\n\nThe advisory recommends immediate action: all secrets and keys stored on affected computers should be rotated immediately from a different, uncompromised machine. While the package should be removed, there is no guarantee that removal will eliminate all malicious software that may have been installed as a result of the initial compromise, given that the attacker may have gained full control of the system.\n\nAffected users should treat their systems as potentially fully compromised and take appropriate incident response measures.
Indicators of compromise
- Packages
- fastify-bundler
Remediation
- Immediately rotate all secrets, API keys, and credentials from a clean, uncompromised computer
- Remove the fastify-bundler package from all affected systems
- Perform a full security audit and malware scan of any system that had fastify-bundler installed
- Review system logs and network traffic for signs of unauthorized access or data exfiltration
- Consider rebuilding affected systems from clean media if full compromise is suspected
- Notify any services or systems that may have been accessed using credentials stored on compromised machines
Sources
- GitHub Advisory GHSA-f99h-9jhg-jrxw · GitHub Advisory Database
Cite this entry
"Malware in fastify-bundler." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 22, 2026; last updated July 22, 2026. https://supplychainattack.org/incident/malware-in-fastify-bundler-5hej5s
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