What’s Vulnerable › Vulnerabilities

CVE-2026-63421: Keystone: `graphql.maxTake` bypass with negative `take`

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-21 · updated 2026-10-12
• Weakness: CWE-20

Description

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.

Affected products

• keystonejs keystone: before 6.5.3

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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