{"id":"CVE-2026-75508","summary":"GraphQL-core: Denial of service via comment tokens bypassing the parser's max_tokens limit","details":"GraphQL-core is a Python port of the GraphQL.js reference implementation. From 3.2.3 until 3.2.12 and 3.3.0rc1, the parser's max_tokens limit in Parser.advance_lexer counts only non-comment tokens returned after Lexer.lookahead skips comments. Each skipped comment is still allocated as a Token and retained through token.next and token.prev, allowing a highly compressible comment-padded GraphQL document to pass a low token limit while consuming memory. An unauthenticated remote attacker can exhaust worker memory before AST-based depth or complexity controls run. This issue is fixed in versions 3.2.12 and 3.3.0rc1.","aliases":["GHSA-r77w-qph3-7vf8"],"modified":"2026-10-23T02:45:55.336106968Z","published":"2026-10-22T16:10:17.124Z","database_specific":{"cwe_ids":["CWE-400","CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75508.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75508.json"},{"type":"FIX","url":"https://github.com/graphql-python/graphql-core/commit/437dea102e92fdf05a2971ca76787c5a5bad875a"},{"type":"FIX","url":"https://github.com/graphql-python/graphql-core/commit/80ef435a1808fbbcc4aaac63ae76771a1c91002d"},{"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-r77w-qph3-7vf8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75508"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/graphql-python/graphql-core","events":[{"introduced":"430ee891a52d239adadf133d873fdca2a3fe009b"},{"fixed":"af6addb1bf39e3b111ae7b805d774326a02f1079"},{"introduced":"f7e937ca298d90bca74cc1c90904f585c516a0bb"},{"fixed":"2d72d39ce7107226b9bcd5cc47835a19da0c2c87"},{"fixed":"437dea102e92fdf05a2971ca76787c5a5bad875a"},{"fixed":"80ef435a1808fbbcc4aaac63ae76771a1c91002d"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"3.2.3"},{"fixed":"3.2.12"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"introduced":"3.3.0a3"},{"fixed":"3.3.0rc1"}]},{"source":"REFERENCES_COMMIT","range":[{"fixed":"437dea102e92fdf05a2971ca76787c5a5bad875a"}]},{"range":[{"fixed":"80ef435a1808fbbcc4aaac63ae76771a1c91002d"}],"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"}]}}],"versions":["v3.2.11","v3.3.0rc0","v3.3.0b2","v3.3.0b1","v3.3.0b0","v3.3.0a14","v3.3.0a13","v3.2.10","v3.2.9","v3.2.8","v3.3.0a12","v3.2.7","v3.3.0a11","v3.3.0a10","v3.3.0a9","v3.3.0a8","v3.2.6","v3.3.0a7","v3.2.5","v3.2.4","v3.2.3","v3.3.0a6","v3.3.0a5","v3.3.0a4","v3.3.0a3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75508.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}