Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 5.2 prior to 18.2.8, 18.3 prior to 18.3.4, and 18.4 prior to 18.4.2 that could have allowed an authenticated attacker to create a denial of service condition by configuring malicious webhook endpoints that send crafted HTTP responses.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 5.2 – < 18.2.8, 18.3 – < 18.3.4, 18.4 – < 18.4.2 | 18.2.8 |
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
- WID-SEC-2025-2236 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 20, 2025
- NCSC-2025-0306 Kwetsbaarheden verholpen in GitLab NCSC-NL (Netherlands) · Oct 13, 2025
References
- https://about.gitlab.com/releases/2025/10/08/patch-release-gitlab-18-4-2-released/
- GitLab Issue #528979 issue-tracking permissions-required
- HackerOne Bug Bounty Report #3058791 technical-description exploit permissions-required