Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| n8n-io | n8n | < 1.123.67, 2.32.0 – < 2.32.1, 2.0.0-rc.0 – < 2.31.5 | 1.123.67 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | n8n | < 1.123.67 | 1.123.67 | GHSA-hx4h-vr3m-45vh |
| npm | n8n | >= 2.32.0, < 2.32.1 | 2.32.1 | GHSA-hx4h-vr3m-45vh |
| npm | n8n | >= 2.0.0-rc.0, < 2.31.5 | 2.31.5 | GHSA-hx4h-vr3m-45vh |
Advisories 1
- WID-SEC-2026-2489 n8n: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
References
- GitHub Security Advisory (GHSA-hx4h-vr3m-45vh) vendor-advisory
- VulnCheck Advisory: n8n before 1.123.67 Prototype Pollution via VM Expression Engine third-party-advisory