GraphQL-core: Denial of service via quadratic complexity in the OverlappingFieldsCanBeMerged validation rule

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-75507
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-22 17:16:59 UTC
Updated2026-10-23 22:17:00 UTC
DescriptionGraphQL-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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.005560000 probability, percentile 0.456610000 (date 2026-10-23)

Problem Types: CWE-400 | CWE-407 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Graphql-python Graphql-core affected >= 3.0.0, < 3.2.12 Not specified
CNA Graphql-python Graphql-core affected >= 3.3.0a1, < 3.3.0rc1 Not specified

References

ReferenceSourceLinkTags
github.com/graphql-python/graphql-core/commit/29c2753a7ee30a96a4109e7c6a... [email protected] github.com
github.com/graphql-python/graphql-core/commit/150e59814d97d12140be005a55... [email protected] github.com
github.com/graphql-python/graphql-core/releases/tag/v3.3.0rc1 [email protected] github.com
github.com/graphql-python/graphql-core/security/advisories/GHSA-vj8h-fx3... [email protected] github.com
github.com/graphql-python/graphql-core/releases/tag/v3.2.12 [email protected] github.com
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