🔐 CVE Alert

CVE-2026-1184

MEDIUM 6.5

Deserialization of Untrusted Data in GitLab

CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-502
Vendor gitlab
Product gitlab
Ecosystems
Industries
Technology
Published May 14, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected Versions

GitLab / GitLab
11.9 < 18.9.7 18.10 < 18.10.6 18.11 < 18.11.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗
hackerone.com: https://hackerone.com/reports/3515842 gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/work_items/586634 about.gitlab.com: https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/

Credits

Thanks [a92847865](https://hackerone.com/a92847865) for reporting this vulnerability through our HackerOne bug bounty program