🔐 CVE Alert

CVE-2026-1388

HIGH 7.5

Inefficient Regular Expression Complexity in GitLab

CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-1333
Vendor gitlab
Product gitlab
Ecosystems
Industries
Technology
Published Feb 25, 2026
Last Updated Feb 26, 2026
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CVSS v3 Breakdown

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

Affected Versions

GitLab / GitLab
9.2 < 18.7.5 18.8 < 18.8.5 18.9 < 18.9.1

References

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

Credits

Thanks [sim4n6](https://hackerone.com/sim4n6) for reporting this vulnerability through our HackerOne bug bounty program