CVE-2023-3909

Inefficient Regular Expression Complexity in GitLab

State: Published
Severity: 4.3 Medium
Published: Nov 6, 2023
Updated: Nov 20, 2025
Reserved: Jul 25, 2023

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L	GitLab

Weaknesses

CWE-1333 Inefficient Regular Expression Complexity

Affected Products

Product	Versions
GitLabGitLab	12.3 to before 16.3.6Affected 16.4 to before 16.4.2Affected 16.5 to before 16.5.1Affected

References

GitLab Issue #418763issue-trackingpermissions-required
HackerOne Bug Bounty Report #2050269technical-descriptionexploitpermissions-required

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