Keystone: `graphql.maxTake` bypass with negative `take`

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63421
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-21 21:17:01 UTC
Updated2026-08-21 21:17:01 UTC
DescriptionKeystone is a content management system for Node.js. Prior to 6.5.3, the findMany resolver in packages/core/src/lib/core/queries/resolvers.ts compares the signed take argument directly with graphql.maxTake, allowing a remote unauthenticated GraphQL client to provide a negative take value whose magnitude exceeds the configured bound. The bypass also applies to relationship queries and can return more records than the developer intended, potentially exhausting service resources. This issue is fixed in version 6.5.3.

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: 0.004690000 probability, percentile 0.387910000 (date 2026-08-23)

Problem Types: CWE-20 | CWE-480 | CWE-20 CWE-20: Improper Input Validation | CWE-480 CWE-480: Use of Incorrect Operator

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 Keystonejs Keystone affected < 6.5.3 Not specified

References

ReferenceSourceLinkTags
github.com/keystonejs/keystone/pull/9859 [email protected] github.com
github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh [email protected] github.com
github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f2040... [email protected] github.com
github.com/keystonejs/keystone/releases/tag/@keystone-6/[email protected] [email protected] github.com
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