Description
An issue has been discovered in GitLab CE/EE affecting all versions from 15.0 before 18.1.6, 18.2 before 18.2.6, and 18.3 before 18.3.2 that could have allowed an authenticated user to stall background job processing by sending specially crafted commit messages, merge request descriptions, or notes.
Affected products
gitlab: gitlab
References3
- about.gitlab.com/releases/2025/09/10/patch-release-gitlab-18-3-… Release NotesVendor Advisory
- gitlab.com/gitlab-org/gitlab/-/issues/519335 Broken Link
- hackerone.com/reports/2903896 Permissions Required
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 42 · as of 8 November 2026
- CWE
- CWE-770
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.