Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.2 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary code on the GitLab server due to an integer overflow issue when compiling a specially crafted regular expression in a CI/CD configuration.
Affected products
gitlab: gitlab
References4
- docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-re… Release NotesVendor Advisory
- gitlab.com/gitlab-org/gitlab/-/work_items/629758 Issue Tracking
- hackerone.com/reports/3995696 Permissions Required
- www.ruby-lang.org/en/news/2026/10/23/regexp-fixes-for-gitlab-cv…
Metrics
- CVSS 3.1
-
9.9
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 50 · as of 9 November 2026
- CWE
- CWE-190
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.