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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.

PUBLISHED Reserved 2025-11-10 | Published 2025-11-15 | Updated 2025-11-17 | Assigner GitLab




LOW: 3.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L

Problem types

CWE-789: Memory Allocation with Excessive Size Value

Product status

Default status
unaffected

16.9 (semver) before 18.3.6
affected

18.4 (semver) before 18.4.4
affected

18.5 (semver) before 18.5.2
affected

Credits

This issue was found finder

References

about.gitlab.com/...12/patch-release-gitlab-18-5-2-released/

gitlab.com/gitlab-org/gitlab/-/issues/296257 (GitLab Issue #296257) issue-tracking permissions-required

hackerone.com/reports/3419588 (HackerOne Bug Bounty Report #3419588) technical-description exploit permissions-required

cve.org (CVE-2025-12983)

nvd.nist.gov (CVE-2025-12983)

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