{"cve":"CVE-2026-75507","nvd":{"published":"2026-10-22T17:16:59.757","modified":"2026-10-23T22:17:00.110","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-407"],"references":["https://github.com/graphql-python/graphql-core/commit/150e59814d97d12140be005a558c93188ef89198","https://github.com/graphql-python/graphql-core/commit/29c2753a7ee30a96a4109e7c6add1a2dae0497d7","https://github.com/graphql-python/graphql-core/releases/tag/v3.2.12","https://github.com/graphql-python/graphql-core/releases/tag/v3.3.0rc1","https://github.com/graphql-python/graphql-core/security/advisories/GHSA-vj8h-fx38-h3vc"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-75507","score":0.006,"percentile":0.48412,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-vj8h-fx38-h3vc","url":"https://osv.dev/vulnerability/GHSA-vj8h-fx38-h3vc","summary":"GraphQL-core: Denial of service via quadratic complexity in the OverlappingFieldsCanBeMerged validation rule","modified":"2026-10-22T16:45:03.746268085Z","packages":[{"ecosystem":"PyPI","name":"graphql-core","purl":"pkg:pypi/graphql-core","ranges":[">=3.0.0 <3.2.12"],"fixed":["3.2.12"]},{"ecosystem":"PyPI","name":"graphql-core","purl":"pkg:pypi/graphql-core","ranges":[">=3.3.0a1 <3.3.0rc1"],"fixed":["3.3.0rc1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}