Double Free in GitLab
CVE-2026-89078
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 a double free issue when parsing a specially crafted regular expression in a CI/CD configuration.
Vulnerability class: Double Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.005 (44.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- GitLab — versions 19.4.0
Weakness classification (CWE)
References
- gitlab.com/gitlab-org/gitlab/-/work_items/628577 (Issue Tracking)
- hackerone.com/reports/4019059 (Permissions Required, technical-description, permissions-required, exploit)
- docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/ (Release Notes, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2026-89078?
- CVE-2026-89078 is a critical-severity vulnerability in GitLab, classified under Double Free. CVSS score: 9.9/10. Published 2026-09-24.
- How severe is CVE-2026-89078?
- Critical severity. CVSS v3 base score is 9.9 out of 10.