Vulnerability in Gitlab
CVE-2026-1388
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
EPSS: 0.004 (27.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Gitlab — versions 18.9.0, 18.8, 9.2
Weakness classification (CWE)
References
- cve@gitlab.com (issue-tracking, permissions-required, Broken Link)
- cve@gitlab.com (Permissions Required, technical-description, permissions-required, exploit)
- cve@gitlab.com (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-1388?
- CVE-2026-1388 is a high-severity vulnerability in Gitlab, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-02-25.
- How severe is CVE-2026-1388?
- High severity. CVSS v3 base score is 7.5 out of 10.