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CVE-2026-1184

Deserialization of Untrusted Data in GitLab

CVSS 6.5 MEDIUMEPSS 0.3%CWE-502
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
GitLab · GitLab
public PoCs found — 1
cve_referencehackerone.com/reports/3515842unverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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