Inefficient regular expression complexity in n8n - #VU146794
Published: September 2, 2026
Vulnerability identifier: #VU146794
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in the default blocked-file-pattern match in the Git node clone operation when processing a crafted destination path. A remote user can supply a specially crafted clone path to cause a denial of service.
Evaluation occurs synchronously in the main process, and a single workflow execution can freeze the instance for other users.
Affected software
n8n
Remediation
Install security update from vendor's website.
n8n - addressed in versions 1.123.76, 2.37.7, 2.38.2