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 .
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
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- gitlab.com/gitlab-org/gitlab/-/work_items/628577
- hackerone.com/reports/4019059 (technical-description, permissions-required, exploit)
- docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/
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.