Incorrect Regular Expression in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2026-1388

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Main Vulnerability Database Vulnerabilities #VU123286

Incorrect Regular Expression in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2026-1388

Published: February 26, 2026


Vulnerability identifier: #VU123286
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-1388
CWE-ID: CWE-185
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: GitLab, Inc
Affected software:
GitLab Enterprise Edition
Gitlab Community Edition

Detailed vulnerability description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing regular expressions in GitLab merge requests. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.


How to mitigate CVE-2026-1388

Install updates from vendor's website.

Sources