PT-2026-21994 · Gitlab · Gitlab Ce/Ee

Sim4N6 · Published 2026-02-25 · Updated 2026-03-02 · CVE-2026-1388

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions GitLab CE/EE versions 9.2 through 18.7.4 GitLab CE/EE versions 18.8 through 18.8.4 GitLab CE/EE versions 18.9 through 18.9.0

Description An unauthenticated user could potentially cause a denial of service by sending specially crafted input to a merge request endpoint. This issue involves a regular expression denial of service.

Recommendations Update GitLab CE/EE to version 18.7.5 or later. Update GitLab CE/EE to version 18.8.5 or later. Update GitLab CE/EE to version 18.9.1 or later.

Exploit

Fix

DoS

Weakness Enumeration

CWE-1333

Related Identifiers

BDU:2026-03432

BIT-GITLAB-2026-1388

CVE-2026-1388

Affected Products

Gitlab Ce/Ee

References · 14

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1388.json · Exploit
• 🔥 https://hackerone.com/reports/3482893 · Exploit
• https://ubuntu.com/security/CVE-2026-1388 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-03432 · Security Note
• https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-1388 · Security Note
• https://osv.dev/vulnerability/BIT-gitlab-2026-1388 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-1388 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-1388 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-1388 · Vendor Advisory
• https://twitter.com/CVEnew/status/2027099281606533518 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2026901311069798838 · Twitter Post
• https://t.me/CVEtracker/45763 · Telegram Post
• https://gitlab.com/gitlab-org/gitlab/-/issues/587560 · Note