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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.

PUBLISHED Reserved 2026-01-19 | Published 2026-05-14 | Updated 2026-05-14 | Assigner GitLab




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-502: Deserialization of Untrusted Data

Product status

Default status
unaffected

11.9 (semver) before 18.9.7
affected

18.10 (semver) before 18.10.6
affected

18.11 (semver) before 18.11.3
affected

Credits

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

References

hackerone.com/reports/3515842 (HackerOne Bug Bounty Report #3515842) technical-description exploit permissions-required

gitlab.com/gitlab-org/gitlab/-/work_items/586634

about.gitlab.com/...3/patch-release-gitlab-18-11-3-released/

cve.org (CVE-2026-1184)

nvd.nist.gov (CVE-2026-1184)

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