Home

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.11 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to cause a denial of service condition due to improper input validation on webhook custom header names under certain conditions.

PUBLISHED Reserved 2025-11-25 | Published 2026-03-11 | Updated 2026-03-12 | 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-770: Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

16.11 (semver) before 18.7.6
affected

18.8 (semver) before 18.8.6
affected

18.9 (semver) before 18.9.2
affected

Credits

Thanks [sim4n6](https://hackerone.com/sim4n6) for reporting this vulnerability through our HackerOne bug bounty program finder

References

hackerone.com/reports/3415683 (HackerOne Bug Bounty Report #3415683) technical-description exploit permissions-required

gitlab.com/gitlab-org/gitlab/-/work_items/582096

about.gitlab.com/...11/patch-release-gitlab-18-9-2-released/

cve.org (CVE-2025-13690)

nvd.nist.gov (CVE-2025-13690)

Download JSON