CVE-2023-3909 MEDIUM

CVE-2023-3909: Inefficient Regular Expression Complexity in GitLab

Vendor Gitlab
Product GitLab
Weakness CWE-1333
Published November 6, 2023
Last update November 20, 2025
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.3 before 16.3.6, all versions starting from 16.4 before 16.4.2, all versions starting from 16.5 before 16.5.1. A Regular Expression Denial of Service was possible by adding a large string in timeout input in gitlab-ci.yml file.

Key dates

02Disclosure timeline

November 6, 2023 CVE published
November 20, 2025 Record updated