CVE-2026-1388

EUVD-2026-8721
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
gitlabgitlab
9.2.0 ≤
𝑥
< 18.7.5
gitlabgitlab
9.2.0 ≤
𝑥
< 18.7.5
gitlabgitlab
18.8.0 ≤
𝑥
< 18.8.5
gitlabgitlab
18.8.0 ≤
𝑥
< 18.8.5
gitlabgitlab
18.9.0
gitlabgitlab
18.9.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
gitlab
sid
vulnerable
Common Weakness Enumeration
References
https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/587560
https://hackerone.com/reports/3482893