Denial of Service Vulnerability in GitLab Products by GitLab
CVE-2026-1659

7.5HIGH

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
14 May 2026

What is CVE-2026-1659?

A vulnerability exists in GitLab CE/EE that affects various versions, potentially allowing unauthenticated users to execute denial of service attacks. This can occur when specially crafted requests are sent due to a lack of proper input validation mechanisms. As a result, the service may become unavailable, affecting users and organizations relying on GitLab for their workflow.

Affected Version(s)

GitLab 9.0 < 18.9.7

GitLab 18.10 < 18.10.6

GitLab 18.11 < 18.11.3

References

https://hackerone.com/reports/3519824
technical-descriptionexploitpermissions-required
https://gitlab.com/gitlab-org/gitlab/-/work_items/588201
https://about.gitlab.com/releases/2026/05/13/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 [a92847865](https://hackerone.com/a92847865) for reporting this vulnerability through our HackerOne bug bounty program
.