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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.3 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that under certain conditions could have allowed an authenticated user to cause a denial of service due to improper handling of webhook response data.

PUBLISHED Reserved 2025-10-31 | Published 2026-03-11 | Updated 2026-03-11 | 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

9.3 (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/3395198 (HackerOne Bug Bounty Report #3395198) technical-description exploit permissions-required

gitlab.com/gitlab-org/gitlab/-/work_items/579170

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

cve.org (CVE-2025-12576)

nvd.nist.gov (CVE-2025-12576)

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