CVE-2026-72769CWE-1321

CVE-2026-72769

High · published August 11, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
42.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00514 · 42.9th percentile
Weakness
CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Published
2026-08-11T17:19Z
Affected products (3)
ProductVersionsFixed in
n8n/n8n< 1.123.671.123.67
n8n/n8n≥ 2.0.0, < 2.31.52.31.5
n8n/n8nall versions—
References (2)
https://github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh · [email protected]https://www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-vm-expression-engine · [email protected]
EPSS history
Timeline
  • 11 AUG 12:17Z
    n8n before 1.123.67 Prototype Pollution via VM Expression Engine
    cvelistv5