CVE-2026-1388 — Regex Denial of Service in Gitlab

CWE-1333 — Regex Denial of ServiceCWE-79 — Cross-site Scripting7 documents7 sources
Severity
7.5HIGHNVD
GHSA5.4
EPSS
0.0%
top 85.14%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
GitlabWwbn AvideoDebian Gitlab+1 more
Timeline
PublishedFeb 25
Latest updateApr 14

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages6 packages

▶CVEListV5gitlab/gitlab9.2 — 18.7.5+2
▶NVDgitlab/gitlab9.2.0 — 18.7.5+2
▶debiandebian/gitlab
▶gitlabgitlab/gitlab

🔴Vulnerability Details

3
GHSA
WWBN AVideo has an incomplete fix for CVE-2026-33500: XSS↗2026-04-14
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GHSA
GHSA-35pf-5r93-c5jc: GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9↗2026-02-25
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OSV
CVE-2026-1388: GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9↗2026-02-25
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📋Vendor Advisories

2
GitLab
CVE-2026-1388: 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 ha↗2026-02-25
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Debian
CVE-2026-1388: gitlab - GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 b...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-1388 Impact, Exploitability, and Mitigation Steps | Wiz↗
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