CVE-2026-3988
Received Received - Intake
Denial of Service in GitLab GraphQL via Input Validation Flaw

Publication date: 2026-03-25

Last updated on: 2026-03-26

Assigner: GitLab Inc.

Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing.
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Meta Information
Published
2026-03-25
Last Modified
2026-03-26
Generated
2026-06-17
AI Q&A
2026-03-25
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3988
EUVD
EUVD-2026-15937
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
gitlab gitlab From 18.9.0 (inc) to 18.9.3 (exc)
gitlab gitlab 18.10.0
gitlab gitlab From 18.5.0 (inc) to 18.8.7 (exc)
gitlab gitlab From 18.9.0 (inc) to 18.9.3 (exc)
gitlab gitlab From 18.5.0 (inc) to 18.8.7 (exc)
gitlab gitlab 18.10.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-407 An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
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Executive Summary

This vulnerability in GitLab CE/EE affects versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1. It allows an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive. The issue arises due to improper input validation in the processing of GraphQL requests.

Impact Analysis

The impact of this vulnerability is a denial of service (DoS) condition. An attacker who is not authenticated can exploit this flaw to make the GitLab instance unresponsive, potentially disrupting access to the service and affecting availability.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade your GitLab instance to a fixed version. Specifically, update to GitLab CE/EE versions 18.8.7 or later, 18.9.3 or later, or 18.10.1 or later, as these versions contain the remediation for the denial of service issue caused by improper input validation in GraphQL request processing.

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