{"id":"CVE-2026-75507","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-75507","generatedAt":"2026-10-28T00:57:01.431Z","title":"An unauthenticated remote attacker can submit a shallow, highly compressible GraphQL query that pins a worker process and can saturate a multi-worker service.","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.","published":"2026-10-22T17:17:00.000Z","lastModified":"2026-10-23T22:17:00.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400","CWE-407"],"affected":[],"epss":{"score":0.006,"percentile":0.48428,"date":"2026-10-26","history":[{"date":"2026-10-23","score":0.00556,"percentile":0.45661}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.60%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-22T17:17:00.000Z","detail":{"score":"7.5","severity":"HIGH","publishedAt":"2026-10-22T17:16:59.757Z"},"summary":"New CVE, high severity (CVSS 7.5)."}],"references":[{"url":"https://github.com/graphql-python/graphql-core/commit/150e59814d97d12140be005a558c93188ef89198","source":"security-advisories@github.com"},{"url":"https://github.com/graphql-python/graphql-core/commit/29c2753a7ee30a96a4109e7c6add1a2dae0497d7","source":"security-advisories@github.com"},{"url":"https://github.com/graphql-python/graphql-core/releases/tag/v3.2.12","source":"security-advisories@github.com"},{"url":"https://github.com/graphql-python/graphql-core/releases/tag/v3.3.0rc1","source":"security-advisories@github.com"},{"url":"https://github.com/graphql-python/graphql-core/security/advisories/GHSA-vj8h-fx38-h3vc","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-75507","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}