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    1 vulnerability by webonyx

    CVE-2026-40476 (GCVE-0-2026-40476)

    Vulnerability from cvelistv5 – Published: 2026-04-17 21:42 – Updated: 2026-04-20 14:56
    VLAI
    Title
    graphql-php: Denial of Service via quadratic complexity in OverlappingFieldsCanBeMerged validation
    Summary
    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.
    Severity
    6.9 (Medium)
    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
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-407 - Inefficient Algorithmic Complexity
    Assigner
    References
    Impacted products
    Vendor Product Version
    webonyx graphql-php Affected: < 15.31.5
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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