High severity7.5NVD Advisory· Published Feb 25, 2026· Updated Jun 17, 2026
CVE-2026-1388
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
7cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*range: 9.2
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*range: >=9.2.0,<18.7.5
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*range: >=9.2.0,<18.7.5
- cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:community:*:*:*
- cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:enterprise:*:*:*
- Range: 9.2 <= v < 18.7.5, 18.8 <= v < 18.8.5, 18.9 <= v < 18.9.1
Patches
Vulnerability mechanics
References
3- about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/nvdRelease NotesVendor Advisory
- gitlab.com/gitlab-org/gitlab/-/issues/587560nvdBroken Link
- hackerone.com/reports/3482893nvdPermissions Required
News mentions
1- GitLab Patch Release: 18.9.1, 18.8.5, 18.7.5GitLab Security Releases · Feb 25, 2026