CVE-2025-13690
Received Received - Intake
Denial of Service via Webhook Header Validation in GitLab

Publication date: 2026-03-11

Last updated on: 2026-03-13

Assigner: GitLab Inc.

Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.11 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to cause a denial of service condition due to improper input validation on webhook custom header names under certain conditions.
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Meta Information
Published
2026-03-11
Last Modified
2026-03-13
Generated
2026-06-16
AI Q&A
2026-03-11
EPSS Evaluated
2026-06-15
NVD
CVE-2025-13690
EUVD
EUVD-2025-208574
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
gitlab gitlab From 18.8.0 (inc) to 18.8.6 (exc)
gitlab gitlab From 18.9.0 (inc) to 18.9.2 (exc)
gitlab gitlab From 18.8.0 (inc) to 18.8.6 (exc)
gitlab gitlab From 18.9.0 (inc) to 18.9.2 (exc)
gitlab gitlab From 16.11.0 (inc) to 18.7.6 (exc)
gitlab gitlab From 16.11.0 (inc) to 18.7.6 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
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Executive Summary

CVE-2025-13690 is a Denial of Service (DoS) vulnerability in GitLab Community Edition (CE) and Enterprise Edition (EE). It is caused by improper input validation on webhook custom header names. An authenticated user could exploit this flaw to trigger a denial of service condition under certain circumstances by manipulating the webhook custom headers feature.

Impact Analysis

This vulnerability can impact you by causing a denial of service condition in your GitLab instance. It affects availability, meaning that an attacker with low privileges and no user interaction required can disrupt the normal operation of GitLab, potentially making the service unavailable to legitimate users.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate the CVE-2025-13690 vulnerability, users should immediately upgrade GitLab CE/EE to the patched versions 18.9.2, 18.8.6, or 18.7.6 depending on their current version.

Be aware that the patch release may include database migrations which could cause downtime during upgrade on single-node instances. Multi-node instances can achieve zero-downtime upgrades if properly configured.

Upgrading to these versions will remediate the denial of service vulnerability caused by improper input validation on webhook custom header names.

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