CVE-2023-3909

MEDIUM

GitLab 12.3-16.3.5, 16.4-16.4.1, 16.5 - Regular Expression Denial of Service via gitlab-ci.yml Timeout Input

Title source: llm

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.

References (2)

Core 2

Core References

Broken Link issue-tracking permissions-required

https://gitlab.com/gitlab-org/gitlab/-/issues/418763

Permissions Required technical-description exploit permissions-required

https://hackerone.com/reports/2050269

Scores

CVSS v3 4.3

EPSS 0.0060

EPSS Percentile 43.6%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-1333

Status published

Products (2)

gitlab/gitlab 16.5.0 (2 CPE variants)

gitlab/gitlab 12.3.0 - 16.3.6 (2 CPE variants)

Published Nov 06, 2023

Tracked Since Feb 18, 2026