Time-of-check Time-of-use (TOCTOU) Race Condition in n8n - #VU137169
Published: July 8, 2026
Vulnerability identifier: #VU137169
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to a time-of-check time-of-use race condition in the Git node clone operation when cloning a repository. A remote user can swap a directory for a symlink after path validation to execute arbitrary code.
Exploitation requires the ability to create and run workflows using the Git node, and the planted repository is loaded as a custom node on the next restart.
Remediation
Install security update from vendor's website.