Denial of Service Vulnerability in GitLab by GitLab Inc.
CVE-2026-1101

6.5MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
8 April 2026

What is CVE-2026-1101?

An issue has been identified in GitLab EE that affects multiple versions, where improper input validation in GraphQL queries could allow an authenticated user to initiate a denial of service attack on the GitLab instance. This vulnerability is significant as it could disrupt services, impacting user access and operational continuity. GitLab has released patches to address this flaw, emphasizing the need for users to update their installations promptly.

Affected Version(s)

GitLab 18.2 < 18.8.9

GitLab 18.9 < 18.9.5

GitLab 18.10 < 18.10.3

References

https://hackerone.com/reports/3460228
technical-descriptionexploitpermissions-required
https://gitlab.com/gitlab-org/gitlab/-/work_items/586488
https://about.gitlab.com/releases/2026/04/08/patch-releas...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [sim4n6](https://hackerone.com/sim4n6) for reporting this vulnerability through our HackerOne bug bounty program
.