Home

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing.

PUBLISHED Reserved 2026-03-11 | Published 2026-03-25 | Updated 2026-03-25 | Assigner GitLab




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-407: Inefficient Algorithmic Complexity

Product status

Default status
unaffected

18.5 (semver) before 18.8.7
affected

18.9 (semver) before 18.9.3
affected

18.10 (semver) before 18.10.1
affected

Credits

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

References

gitlab.com/gitlab-org/gitlab/-/work_items/593140

hackerone.com/reports/3597342 (HackerOne Bug Bounty Report #3597342) technical-description exploit permissions-required

about.gitlab.com/...5/patch-release-gitlab-18-10-1-released/

cve.org (CVE-2026-3988)

nvd.nist.gov (CVE-2026-3988)

Download JSON