Vulnerability · Published May 14, 2026 · Assigned by GitLab
CVE-2026-1184Deserialization of Untrusted Data in GitLab
Medium 6.5
In plain English
A medium-severity unsafe deserialization in GitLab from GitLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 73.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- HackerOne Bug Bounty Report #3515842 technical-description, exploit, permissions-required
- https://gitlab.com/gitlab-org/gitlab/-/work_items/586634
- https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/