CVE-2023-3909

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.

CVSS v3.1

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1

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

EPSS

0.60% chance of exploitation in the next 30 days, 46th percentile

Published

2023-11-06

Updated

2025-11-20

Proof-of-concept exploits (1)

• https://hackerone.com/reports/2050269

References

• CVE Record
• NVD entry

Related

• CVE-2023-39075
• CVE-2023-39108
• CVE-2023-39070
• CVE-2023-39109
• CVE-2023-3907
• CVE-2023-39110