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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/	Release Notes Vendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/587560	Broken Link
https://hackerone.com/reports/3482893	Permissions Required

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:gitlab:gitlab:::::community:::*
	cpe:2.3:a:gitlab:gitlab:::::enterprise:::*
	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:::

History

No history.

Information

Published : 2026-02-25 21:16

Updated : 2026-02-28 00:45

NVD link : CVE-2026-1388

Mitre link : CVE-2026-1388

CVE.ORG link : CVE-2026-1388

JSON object : View

Products Affected

gitlab

gitlab

CWE

CWE-1333

Inefficient Regular Expression Complexity

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