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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 12.3 – < 16.3.6, 16.4 – < 16.4.2, 16.5 – < 16.5.1 | 16.3.6 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | gitlab | No fix yet | — |
Advisories 1
- WID-SEC-2023-2788 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 29, 2026
References
- GitLab Issue #418763 issue-tracking permissions-required
- HackerOne Bug Bounty Report #2050269 technical-description exploit permissions-required