Denial of Service Vulnerability in GitLab Products
CVE-2026-3988

7.5HIGH

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
25 March 2026

What is CVE-2026-3988?

GitLab has addressed a vulnerability within its CE/EE versions that could be exploited by an unauthenticated user to launch a Denial of Service attack. This particular issue arises from improper input validation during GraphQL request processing, which could render the GitLab instance unresponsive. It's crucial for users of affected versions to update promptly to maintain the integrity and availability of their GitLab environment.

Affected Version(s)

GitLab 18.5 < 18.8.7

GitLab 18.9 < 18.9.3

GitLab 18.10 < 18.10.1

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/593140
https://hackerone.com/reports/3597342
technical-descriptionexploitpermissions-required
https://about.gitlab.com/releases/2026/03/25/patch-releas...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [svalkanov](https://hackerone.com/svalkanov) for reporting this vulnerability through our HackerOne bug bounty program
.