CVE-2026-1388
Inefficient Regular Expression Complexity in GitLab
7.5
HIGH
CVSS 3.1
EPSS 0.05%
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.
How to fix CVE-2026-1388
To remediate CVE-2026-1388, upgrade the affected package to a fixed version below.
- —upgrade to 18.7.5 or later
Is CVE-2026-1388 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 9.2.0, < 18.7.5, >= 18.8.0, < 18.8.5, >= 18.9.0, < 18.9.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |