Unrated severityNVD Advisory· Published Nov 6, 2023· Updated Nov 20, 2025
Inefficient Regular Expression Complexity in GitLab
CVE-2023-3909
Description
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.
Affected products
3- Range: >=12.3 <16.3.6, >=16.4 <16.4.2, >=16.5 <16.5.1
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
2- hackerone.com/reports/2050269mitretechnical-descriptionexploitpermissions-required
- gitlab.com/gitlab-org/gitlab/-/issues/418763mitreissue-trackingpermissions-required
News mentions
1- GitLab Security Release: 16.5.1, 16.4.2, 16.3.6GitLab Security Releases · Oct 31, 2023