CVE-2026-63421
Keystone: `graphql.maxTake` bypass with negative `take`
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-20 CWE-480 |
| Vendor | keystonejs |
| Product | keystone |
| Published | Aug 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
keystonejs / keystone
< 6.5.3
References
github.com: https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh github.com: https://github.com/keystonejs/keystone/pull/9859 github.com: https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1 github.com: https://github.com/keystonejs/keystone/releases/tag/@keystone-6/[email protected]