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CVE-2026-75507

7.5 high SSVC exploitation: none Deferred
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 3

  1. StatusPublished → DeferredNVD modified 2026-10-22 17:40
  2. StatusReceived → PublishedNVD modified 2026-10-22 16:12
  3. First seenCVSS 7.5NVD modified 2026-10-22 17:16

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 5