CVE-2026-1388
Inefficient Regular Expression Complexity in GitLab
- State
- Published
- Severity
- 7.5 High
- Published
- Feb 25, 2026
- Updated
- Feb 26, 2026
- Reserved
- Jan 23, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitLab |
Weaknesses
- CWE-1333 Inefficient Regular Expression Complexity
Affected Products
| Product | Versions |
|---|---|
GitLabGitLab |
|
References
- GitLab Issue #587560issue-trackingpermissions-required
- HackerOne Bug Bounty Report #3482893technical-descriptionexploitpermissions-required
- https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/
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