Improper input validation in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2026-3988
Published: March 25, 2026 / Updated: March 25, 2026
Vulnerability identifier: #VU124601
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-3988
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by making the GitLab instance unresponsive.
The vulnerability exists due to improper input validation in the GraphQL API when handling requests. A remote attacker can send a specially crafted GraphQL request to trigger excessive resource consumption and cause a denial of service.
Affected software
GitLab Enterprise Edition
Gitlab Community Edition
Gitlab Community Edition
How to mitigate CVE-2026-3988
Install security update from vendor's website.
GitLab Enterprise Edition - addressed in versions 18.8.7, 18.9.3, 18.10.1
Gitlab Community Edition - addressed in versions 18.8.7, 18.9.3, 18.10.1
Gitlab Community Edition - addressed in versions 18.8.7, 18.9.3, 18.10.1