CVE-2026-72769
MediumCVSS 6.1Summary
n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.
Risk Assessment
An attacker could cause a denial of service, potentially disrupting system operations and affecting availability. This is a moderate risk to availability.
Recommendation
Update n8n to version 1.123.67, 2.31.5, or 2.32.1 to fix the prototype pollution vulnerability in the VM expression engine.
Original NVD description (English source)
n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.