Unrated severityNVD Advisory· Published Feb 25, 2026· Updated Feb 26, 2026
Inefficient Regular Expression Complexity in GitLab
CVE-2026-1388
Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions.
Affected products
2cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*range: 9.2
- (no CPE)range: >=9.2, <18.7.5 || >=18.8, <18.8.5 || >=18.9, <18.9.1
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- hackerone.com/reports/3482893mitretechnical-descriptionexploitpermissions-required
- gitlab.com/gitlab-org/gitlab/-/issues/587560mitreissue-trackingpermissions-required
- about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/mitre
News mentions
1- GitLab Patch Release: 18.9.1, 18.8.5, 18.7.5GitLab Security Releases · Feb 25, 2026