---
id: CVE-2026-72769
title: >-
  n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution
  vulnerability in the VM expression engine
summary: >-
  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 …
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-1321
vendor: n8n
product: n8n
affected:
  - n8n < 1.123.67
  - 'n8n >= 2.0.0, < 2.31.5'
  - n8n = 2.32.0
patched:
  - n8n 2.31.5
published: '2026-08-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:46:21.837'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72769'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-vm-expression-engine
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00514
epssPercentile: 0.41212
ingestedAt: '2026-09-09T21:22:45.527Z'
---

## Overview

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

- `n8n < 1.123.67`
- `n8n >= 2.0.0, < 2.31.5`
- `n8n = 2.32.0`

## Remediation

Upgrade past the affected range:

- `n8n 2.31.5`