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VULNERABILITIES

CVE-2026-40476 Details

Description

graphql-go is a Go implementation of GraphQL. In versions 15.31.4 and below, the OverlappingFieldsCanBeMerged validation rule performs O(n²) pairwise comparisons of fields sharing the same response name. An attacker can send a query with thousands of repeated identical fields, causing excessive CPU usage during validation before execution begins. This is not mitigated by existing QueryDepth or QueryComplexity rules. This issue has been fixed in version 15.31.5.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
http://www.openwall.com/lists/oss-security/2026/09/14/26 CVE
https://github.com/webonyx/graphql-php/releases/tag/v15.31.5 [email protected]Release Notes
https://github.com/webonyx/graphql-php/security/advisories/GHSA-68jq-c3rv-pcrr [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-407Inefficient Algorithmic Complexity[email protected]

Affected Products

ProductVersions
webonyx graphql-php
< 15.31.5

CPE

  • cpe:2.3:a:webonyx:graphql-php:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

6 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-40476
NVD Published Date:
Apr 17, 2026
NVD Last Modified:
Sep 14, 2026
Source:
[email protected]
CVE-2026-40476 Details - Not Deferred