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VULNERABILITIES

CVE-2026-1388 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/ [email protected]Release NotesVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/587560 [email protected]Broken Link
https://hackerone.com/reports/3482893 [email protected]Permissions Required

Weakness Enumeration

CWE-IDCWE NameSource
CWE-1333Inefficient Regular Expression Complexity[email protected]

Affected Products

ProductVersions
gitlab gitlab
>= 9.2.0, < 18.7.5
>= 18.8.0, < 18.8.5
18.9.0

CPE

  • cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:enterprise:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-1388
NVD Published Date:
Feb 25, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-1388 Details - Not Deferred