Denial of service vulnerability in GitLab CE/EE affecting multiple versions
CVE-2025-13690

6.5MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
11 March 2026

What is CVE-2025-13690?

A denial of service vulnerability exists in GitLab CE/EE due to improper input validation on webhook custom header names. An authenticated user could exploit this flaw to induce a denial of service condition, potentially impacting application availability. The issue affects all versions from 16.11 prior to 18.7.6, 18.8 prior to 18.8.6, and 18.9 prior to 18.9.2, and has been addressed in security updates aimed at enhancing the robustness of input handling.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

GitLab 16.11 < 18.7.6

GitLab 18.8 < 18.8.6

GitLab 18.9 < 18.9.2

References

https://hackerone.com/reports/3415683
technical-descriptionexploitpermissions-required
https://gitlab.com/gitlab-org/gitlab/-/work_items/582096
https://about.gitlab.com/releases/2026/03/11/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
JSON
.