CVE-2026-1388

Inefficient Regular Expression Complexity in GitLab

CVSS 7.5 HIGHEPSS 0.4%CWE-1333

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

25 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

GitLab · GitLab

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References

https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/https://gitlab.com/gitlab-org/gitlab/-/issues/587560 https://hackerone.com/reports/3482893