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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: 2026-04-17 21:42
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
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
Vendor Product Version
webonyx graphql-php Affected: < 15.31.5
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "graphql-php",
          "vendor": "webonyx",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 15.31.5"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "graphql-go is a Go implementation of GraphQL. In versions 15.31.4 and below, the OverlappingFieldsCanBeMerged validation rule performs O(n\u00b2) 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": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-17T21:42:59.511Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/webonyx/graphql-php/security/advisories/GHSA-68jq-c3rv-pcrr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/webonyx/graphql-php/security/advisories/GHSA-68jq-c3rv-pcrr"
        },
        {
          "name": "https://github.com/webonyx/graphql-php/releases/tag/v15.31.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/webonyx/graphql-php/releases/tag/v15.31.5"
        }
      ],
      "source": {
        "advisory": "GHSA-68jq-c3rv-pcrr",
        "discovery": "UNKNOWN"
      },
      "title": "graphql-php: Denial of Service via quadratic complexity in OverlappingFieldsCanBeMerged validation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40476",
    "datePublished": "2026-04-17T21:42:59.511Z",
    "dateReserved": "2026-04-13T19:50:42.113Z",
    "dateUpdated": "2026-04-17T21:42:59.511Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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