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CVE-2026-40476— graphql-php: Denial of Service via quadratic complexity in OverlappingFieldsCanBeMerged validation

Quick assessment

Affected
webonyx graphql-php
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

graphql-go是Webonyx开源的一款专注于易用性的 GraphQL 服务器。 graphql-go 15.31.5之前版本存在安全漏洞，该漏洞源于OverlappingFieldsCanBeMerged验证规则对共享相同响应名称的字段执行O(n²)成对比较，可能导致攻击者发送包含数千个重复相同字段的查询，在验证期间消耗过多CPU。

CVSS 6.9 · Medium EPSS 0.73% · P53

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
webonyx graphql-php < 15.31.5 affected
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I. Basic Information for CVE-2026-40476

Vulnerability Information
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Vulnerability Title
graphql-php: Denial of Service via quadratic complexity in OverlappingFieldsCanBeMerged validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
graphql-go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
graphql-go是Webonyx开源的一款专注于易用性的 GraphQL 服务器。 graphql-go 15.31.5之前版本存在安全漏洞，该漏洞源于OverlappingFieldsCanBeMerged验证规则对共享相同响应名称的字段执行O(n²)成对比较，可能导致攻击者发送包含数千个重复相同字段的查询，在验证期间消耗过多CPU。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
webonyx graphql-php < 15.31.5 -

II. Public POCs for CVE-2026-40476

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III. Intelligence Information for CVE-2026-40476

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Vendor Advisories for CVE-2026-40476 (1)

IV. Related Vulnerabilities

Same product: graphql-php
Same vendor: webonyx
Same weakness: CWE-407

V. Comments for CVE-2026-40476

Anonymous User
2026-08-30 14:37:53

test'

Anonymous User
2026-08-30 14:37:53

*

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