Improper isolation or compartmentalization in n8n - CVE-2026-126391
Published: November 4, 2026 / Updated: November 13, 2026
Vulnerability identifier: #VU159341
CSH Severity: Low
CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126391
CWE-ID: CWE-653
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code on the n8n host.
The vulnerability exists due to insufficient isolation in n8n's workflow expression evaluation component when evaluating user-controlled expressions. A remote user can create or modify a workflow containing crafted expressions to escape the evaluation isolation and execute arbitrary code on the host.
Affected software
n8n
How to mitigate CVE-2026-126391
Install security update from vendor's website.
n8n - addressed in versions 1.123.89, 2.45.5, 2.46.1, 3.0.1