What is CVE-2026-1456?

CVE-2026-1456 is a medium-severity vulnerability in GitLab, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-02-11.

How severe is CVE-2026-1456?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in GitLab

CVE-2026-1456

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.

EPSS: 0.004 (29.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Gitlab — versions 18.7, 18.8

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

cve@gitlab.com (issue-tracking, permissions-required, Issue Tracking, Broken Link)
cve@gitlab.com (Permissions Required, technical-description, permissions-required, exploit)
cve@gitlab.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-1456?: CVE-2026-1456 is a medium-severity vulnerability in GitLab, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-02-11.
How severe is CVE-2026-1456?: Medium severity. CVSS v3 base score is 6.5 out of 10.