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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.10 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that could have allowed an unauthenticated user to cause a Denial of Service condition by sending specifically crafted requests containing malicious JSON payloads.

PUBLISHED Reserved 2025-10-31 | Published 2025-11-26 | Updated 2025-11-28 | 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-770: Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

17.10 (semver) before 18.4.5
affected

18.5 (semver) before 18.5.3
affected

18.6 (semver) before 18.6.1
affected

Credits

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

References

gitlab.com/gitlab-org/gitlab/-/issues/579168 (GitLab Issue #579168) issue-tracking permissions-required

hackerone.com/reports/3362239 (HackerOne Bug Bounty Report #3362239) technical-description exploit permissions-required

cve.org (CVE-2025-12571)

nvd.nist.gov (CVE-2025-12571)

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