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.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.1 · n8nNVD modified 2026-10-23 19:10
Affected (CPE criteria) 2
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*cpe:2.3:a:n8n:n8n:2.32.0:*:*:*:*:node.js:*:*
References 2
- https://github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh Mitigation, Vendor Advisory
- https://www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-vm-expression-engine Third Party Advisory