Deserialization in GitLab
CVE-2026-1184
GitLab has remediated an issue in GitLab EE affecting all versions from 11.9 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to cause denial of service by uploading a specially crafted file due to improper validation.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (23.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- GitLab — versions 11.9, 18.10, 18.11
Weakness classification (CWE)
References
- hackerone.com/reports/3515842 (Permissions Required, technical-description, permissions-required, exploit)
- gitlab.com/gitlab-org/gitlab/-/work_items/586634 (Not Applicable)
- about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/ (Release Notes)
Frequently asked questions
- What is CVE-2026-1184?
- CVE-2026-1184 is a medium-severity vulnerability in GitLab, classified under Deserialization of Untrusted Data. CVSS score: 6.5/10. Published 2026-05-14.
- How severe is CVE-2026-1184?
- Medium severity. CVSS v3 base score is 6.5 out of 10.