CVE-2026-72769: n8n before 1.123.67 Prototype Pollution via VM Expression Engine

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-11 · updated 2026-10-29
Weakness: CWE-1321

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

n8n-io n8n: before 1.123.67; from 2.0.0 before 2.31.5; 2.32.0 (and their updates) — fixed in 1.123.67, 2.31.5
n8n-io n8n: before 1.123.67 — fixed in 1.123.67

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.67, 2.31.5; n8n-io n8n 1.123.67. Check the vendor advisory for mitigations.

References

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