GraphQL-core: Denial of service via comment tokens bypassing the parser's max_tokens limit

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-75508
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-22 17:16:59 UTC
Updated2026-10-29 12:17:13 UTC
DescriptionGraphQL-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.

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: 0.005730000 probability, percentile 0.472680000 (date 2026-10-29)

Problem Types: CWE-400 | CWE-770 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

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 >= 3.2.3, < 3.2.12 Not specified
CNA Graphql-python Graphql-core affected >= 3.3.0a3, < 3.3.0rc1 Not specified

References

ReferenceSourceLinkTags
github.com/graphql-python/graphql-core/security/advisories/GHSA-r77w-qph... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/graphql-python/graphql-core/commit/437dea102e92fdf05a2971ca76... [email protected] github.com
github.com/graphql-python/graphql-core/commit/80ef435a1808fbbcc4aaac63ae... [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/releases/tag/v3.2.12 [email protected] github.com
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