Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.9 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an authenticated user with developer-role permissions to hide changes from merge request diff views due to improper input handling of file names.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 15.9 – < 18.10.8, 18.11 – < 18.11.5, 19.0 – < 19.0.2 | 18.10.8 |
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 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | gitlab-runner-18.6 +35 | No fix yet | — |
| Wolfi rolling | gitlab-runner-19.0 +5 | 19.0.2-r0 | — |
Advisories 2
- NCSC-2026-0196 Kwetsbaarheden verholpen in GitLab Enterprise Edition NCSC-NL (Netherlands) · Jun 12, 2026
- WID-SEC-2026-1886 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 11, 2026
References
- https://gitlab.com/gitlab-org/gitlab/-/work_items/598165
- HackerOne Bug Bounty Report #3638136 technical-description exploit permissions-required
- https://about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released/