Malware in base65-11x
The npm package base65-11x was found to contain malware, potentially giving full control of affected systems to an outside entity. All systems with this package installed should be considered fully compromised.
- Disclosed
- Last updated
- Blast radius
- Any system with the package installed or running
- Ecosystems
- Attack vectors
- Affected entities
- base65-11x
The npm package base65-11x was identified as containing malware. According to the GitHub advisory, 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, there is no guarantee that removal will eliminate all malicious software that may have been installed as a result of the package installation, given the potential for full system compromise.\n\nAffected users should treat their systems as potentially fully compromised and take appropriate incident response measures.
Indicators of compromise
- Packages
- base65-11x
Remediation
- Immediately remove the base65-11x package from all systems
- Rotate all secrets, keys, and credentials from a different, uncompromised computer
- Assume full system compromise and conduct thorough forensic analysis
- Monitor affected systems for signs of unauthorized access or persistence mechanisms
- Consider rebuilding affected systems from clean media if full compromise is suspected
Sources
- GitHub Advisory GHSA-39c6-h85q-hpcw · GitHub Advisory Database
Cite this entry
"Malware in base65-11x." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 11, 2026; last updated August 11, 2026. https://supplychainattack.org/incident/malware-in-base65-11x-1fa9ck
Suggest a correction
Found an error or have a newer source? Corrections to factual errors take priority over new entries.
Related incidents
- resolvedcritical
Malicious code in typescirpt-core (npm)
The npm package 'typescirpt-core' (a typosquat of 'typescript') contained malicious code that executed on install, downloading and executing a Windows executable and pivoting WSL environments back to the host Windows system.
npmTyposquattingCompromised package - containedcritical
Malicious code in typescrit-cli (npm)
The npm package typescrit-cli contained malicious postinstall code that downloads and executes a payload, with capability to escape WSL containers and compromise Windows hosts. The package name is a typosquat of the legitimate typescript-cli.
npmTyposquattingCompromised package - containedcritical
Malicious code in typesript-cli (npm)
The npm package 'typesript-cli' (a one-character typosquat of 'typescript') contains malicious code in its postinstall script that downloads and executes a Windows PE binary, and can cross the Linux/WSL sandbox boundary to execute payloads on the Windows host. The script also beacons to a hardcoded IP endpoint.
npmTyposquattingCompromised package - containedcritical
Malicious code in testingsmthb1g (npm)
The npm package testingsmthb1g contains malicious code in its postinstall script that acts as an install-time dropper, downloading and executing a Windows binary payload and exfiltrating platform information. The attack includes sandbox escape capabilities for WSL/virtualized Linux environments.
npmCompromised package