CVE-2026-1388

HIGH EPSS 27.6%
Published Feb 25, 20264mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Feb 25, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
27.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-1333

Affected Products 6

VendorProductVersionRange
gitlabgitlab*≥9.2.0  –  <18.7.5
gitlabgitlab*≥9.2.0  –  <18.7.5
gitlabgitlab*≥18.8.0  –  <18.8.5
gitlabgitlab*≥18.8.0  –  <18.8.5
gitlabgitlab18.9.0any
gitlabgitlab18.9.0any

References 3

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.