Description
GitLab has remediated an issue in GitLab CE/EE affecting versions from 18.9 before 18.9.1 that could have under certain conditions, allowed an unauthenticated user to cause denial of service by sending specially crafted requests to a CI jobs API endpoint.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 18.9 – < 18.9.1 | 18.9.1 |
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 2
- NCSC-2026-0072 Kwetsbaarheden verholpen in GitLab NCSC-NL (Netherlands) · Feb 27, 2026
- WID-SEC-2026-0529 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 25, 2026
References
- GitLab Issue #588338 issue-tracking permissions-required
- HackerOne Bug Bounty Report #3519773 technical-description exploit permissions-required
- https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/