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Vulnerability record · CVE-2026-1388 · published 25 February 2026

CVE-2026-1388: Gitlab inefficient regular expression (redos) vulnerability

Gitlab · Gitlab

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.

7.5 CVSS 3.1 High EPSS 0.36% · top 72.4% CWE-1333 · Inefficient regular expression (ReDoS)
7.5CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/ Release NotesVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/587560 Broken Link
https://hackerone.com/reports/3482893 Permissions Required

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-1388), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.