Vulnerability in GitLab
CVE-2026-3988
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (56.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.009 · change: +0.004
Affected products
- GitLab — versions 18.10.0, 18.10, 18.5
Weakness classification (CWE)
References
- gitlab.com/gitlab-org/gitlab/-/work_items/593140 (Broken Link)
- hackerone.com/reports/3597342 (Permissions Required, technical-description, permissions-required, exploit)
- about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/ (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-3988?
- CVE-2026-3988 is a high-severity vulnerability in GitLab, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-03-25.
- How severe is CVE-2026-3988?
- High severity. CVSS v3 base score is 7.5 out of 10.