CVE-2026-72769

n8n before 1.123.67 Prototype Pollution via VM Expression Engine

State: Published
Severity: 6.1 Medium
Published: Aug 11, 2026
Updated: Oct 29, 2026
Reserved: Aug 10, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.1 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck

Weaknesses

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Affected Products

Product	Versions
n8nn8n-io	before 1.123.67Affected 1.123.67Not affected
n8nn8n-io	2.32.0 to before 2.32.1Affected 2.32.1Not affected
n8nn8n-io	2.0.0-rc.0 to before 2.31.5Affected 2.31.5Not affected

References

GitHub Security Advisory (GHSA-hx4h-vr3m-45vh)vendor-advisory
VulnCheck Advisory: n8n before 1.123.67 Prototype Pollution via VM Expression Enginethird-party-advisory

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