{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.0.0"
                  },
                  {
                    "fixed": "3.2.12"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "3.3.0a1"
                  },
                  {
                    "fixed": "3.3.0rc1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "150e59814d97d12140be005a558c93188ef89198"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "29c2753a7ee30a96a4109e7c6add1a2dae0497d7"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v3.2.12",
                "range": [
                  {
                    "fixed": "af6addb1bf39e3b111ae7b805d774326a02f1079"
                  }
                ],
                "source": "REFERENCES_TAG"
              },
              {
                "original_tag": "v3.3.0rc1",
                "range": [
                  {
                    "fixed": "2d72d39ce7107226b9bcd5cc47835a19da0c2c87"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "b9b80c016edd1ea72be00d6dd2698be21a8cb875"
            },
            {
              "fixed": "af6addb1bf39e3b111ae7b805d774326a02f1079"
            },
            {
              "introduced": "27c900bcb1fb54f8a945f383ee61d4f95330ff06"
            },
            {
              "fixed": "2d72d39ce7107226b9bcd5cc47835a19da0c2c87"
            },
            {
              "fixed": "150e59814d97d12140be005a558c93188ef89198"
            },
            {
              "fixed": "29c2753a7ee30a96a4109e7c6add1a2dae0497d7"
            }
          ],
          "repo": "https://github.com/graphql-python/graphql-core",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-vj8h-fx38-h3vc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-400",
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75507.json"
  },
  "details": "GraphQL-core is a Python port of the GraphQL.js reference implementation. From 3.0.0 until 3.2.12 and 3.3.0rc1, the OverlappingFieldsCanBeMerged rule in specified_rules repeatedly compares fields that share response names and recursively re-compares flattened inline fragments during the validation phase. The prior named-fragment memoization does not cover this path, so nested repeated inline fragments can drive quadratic and worst-case O(n²·m²) CPU work before any resolver or AST-based depth or complexity control runs. An unauthenticated remote attacker can submit a shallow, highly compressible GraphQL query that pins a worker process and can saturate a multi-worker service. This issue is fixed in versions 3.2.12 and 3.3.0rc1.",
  "id": "CVE-2026-75507",
  "modified": "2026-10-23T02:30:17.410790225Z",
  "published": "2026-10-22T16:12:38.424Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75507.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/graphql-python/graphql-core/commit/150e59814d97d12140be005a558c93188ef89198"
    },
    {
      "type": "FIX",
      "url": "https://github.com/graphql-python/graphql-core/commit/29c2753a7ee30a96a4109e7c6add1a2dae0497d7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/graphql-python/graphql-core/releases/tag/v3.2.12"
    },
    {
      "type": "WEB",
      "url": "https://github.com/graphql-python/graphql-core/releases/tag/v3.3.0rc1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/graphql-python/graphql-core/security/advisories/GHSA-vj8h-fx38-h3vc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75507"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "GraphQL-core: Denial of service via quadratic complexity in the OverlappingFieldsCanBeMerged validation rule"
}