# CVE-2026-63421

## Summary

- **CVE ID:** CVE-2026-63421
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-20, CWE-480
- **Published:** Aug 21, 2026
- **Last Modified:** Aug 26, 2026

## 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 (< 6.5.3)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.47%
- **EPSS Percentile:** 39.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._