CVE-2026-63421

Keystone 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.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-25)

CWEs

CWE-20, CWE-480

Published

2026-08-21

Modified

2026-10-12

Record from

the NVD, synced 2026-10-19

Packages (OSV)

References

• https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1
• https://github.com/keystonejs/keystone/pull/9859
• https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3
• https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh

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