Vulnerability Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before 18.7.4, and 18.8 before 18.8.4 that could have allowed an unauthenticated user to cause denial of service through CPU exhaustion by submitting specially crafted markdown files that trigger exponential processing in markdown preview.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gitlab | Gitlab | >= 18.7.0, < 18.7.4 |
Related Weaknesses (CWE)
References
- https://about.gitlab.com/releases/2026/02/10/patch-release-gitlab-18-8-4-releaseRelease NotesVendor Advisory
- https://gitlab.com/gitlab-org/gitlab/-/issues/587688Broken LinkIssue Tracking
- https://hackerone.com/reports/3517928Permissions Required
FAQ
What is CVE-2026-1456?
CVE-2026-1456 is a vulnerability with a CVSS score of 6.5 (MEDIUM). GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.7 before 18.7.4, and 18.8 before 18.8.4 that could have allowed an unauthenticated user to cause denial of service through...
How severe is CVE-2026-1456?
CVE-2026-1456 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-1456?
Check the references section above for vendor advisories and patch information. Affected products include: Gitlab Gitlab.