{"id":"CVE-2026-75507","published":"2026-10-22T17:16:59.757","lastModified":"2026-10-23T22:17:00.110","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.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-400","CWE-407"],"vendors":[],"products":[],"references":[{"url":"https://github.com/graphql-python/graphql-core/commit/150e59814d97d12140be005a558c93188ef89198","tags":[]},{"url":"https://github.com/graphql-python/graphql-core/commit/29c2753a7ee30a96a4109e7c6add1a2dae0497d7","tags":[]},{"url":"https://github.com/graphql-python/graphql-core/releases/tag/v3.2.12","tags":[]},{"url":"https://github.com/graphql-python/graphql-core/releases/tag/v3.3.0rc1","tags":[]},{"url":"https://github.com/graphql-python/graphql-core/security/advisories/GHSA-vj8h-fx38-h3vc","tags":[]}],"exploitRefs":[{"url":"https://github.com/graphql-python/graphql-core/commit/150e59814d97d12140be005a558c93188ef89198","tags":[]},{"url":"https://github.com/graphql-python/graphql-core/commit/29c2753a7ee30a96a4109e7c6add1a2dae0497d7","tags":[]},{"url":"https://github.com/graphql-python/graphql-core/releases/tag/v3.2.12","tags":[]},{"url":"https://github.com/graphql-python/graphql-core/releases/tag/v3.3.0rc1","tags":[]},{"url":"https://github.com/graphql-python/graphql-core/security/advisories/GHSA-vj8h-fx38-h3vc","tags":[]}],"hasPoc":true,"ai":null}