CVE-2026-1456

EUVD-2026-7048
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 28%
Affected Products (NVD)
VendorProductVersion
gitlabgitlab
18.7.0 ≤
𝑥
< 18.7.4
gitlabgitlab
18.7.0 ≤
𝑥
< 18.7.4
gitlabgitlab
18.8.0 ≤
𝑥
< 18.8.4
gitlabgitlab
18.8.0 ≤
𝑥
< 18.8.4
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://about.gitlab.com/releases/2026/02/10/patch-release-gitlab-18-8-4-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/587688
https://hackerone.com/reports/3517928