Vulnerability Description
n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit prototype pollution to execute arbitrary commands within the runner container. Because the polluted prototype is a process-wide object, the corruption persists across other tenants' Code node executions on the same shared runner. On v1.x instances without task runners enabled, Code node JavaScript runs directly in the main n8n process, where the impact could be higher.
Related Weaknesses (CWE)
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-m3hg-p5r9-fg9h
- https://www.vulncheck.com/advisories/n8n-before-remote-code-execution-via-evente
FAQ
What is CVE-2026-77077?
CVE-2026-77077 is a documented vulnerability. n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constru...
How severe is CVE-2026-77077?
CVSS scoring is not yet available for CVE-2026-77077. Check NVD for updates.
Is there a patch for CVE-2026-77077?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.