Vulnerability · Published Aug 11, 2026 · Assigned by VulnCheck

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

Medium 6.1

In plain English

A medium-severity prototype pollution in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.1Medium

Exploit odds (30 days)0.5%top 56.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	1.123.67	GHSA-hx4h-vr3m-45vh
npm	n8n	2.32.1	GHSA-hx4h-vr3m-45vh
npm	n8n	2.31.5	GHSA-hx4h-vr3m-45vh

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	0 – before 1.123.67
n8n-io	n8n	2.32.0 – before 2.32.1
n8n-io	n8n	2.0.0-rc.0 – before 2.31.5

Weakness: CWE-1321 · Vector: 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

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