CVE-2026-1388: Inefficient Regular Expression Complexity in GitLab
High · CVSS 7.5 (CVSS 3.1)EPSS 0.41%, 35th percentilePublished Updated Assigner: GitLab
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · CWE-1333
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
GitLab: GitLab
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/ (opens in new tab)
- gitlab.com/gitlab-org/gitlab/-/issues/587560 (opens in new tab)
- hackerone.com/reports/3482893 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)