CVE-2026-75507

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

22 Oct 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-22 17:16

Updated : 2026-10-23 22:17

NVD link : CVE-2026-75507

Mitre link : CVE-2026-75507

CVE.ORG link : CVE-2026-75507

JSON object : View

Products Affected

No product.

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-407

Inefficient Algorithmic Complexity

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