---
id: CVE-2026-63421
title: Keystone is a content management system for Node.js
summary: >-
  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
  unauthentica…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-20
  - CWE-480
vendor: keystone-6
product: '@keystone-6/core'
affected:
  - '@keystone-6/core <= 6.5.2'
patched:
  - '@keystone-6/core 6.5.3'
published: '2026-08-21'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:06:39.057'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63421'
references:
  - url: >-
      https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1
    label: security-advisories@github.com
  - url: 'https://github.com/keystonejs/keystone/pull/9859'
    label: security-advisories@github.com
  - url: 'https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3'
    label: security-advisories@github.com
  - url: >-
      https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-cqmq-8755-7xvh'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.0067
epssPercentile: 0.49874
aliases:
  - GHSA-cqmq-8755-7xvh
ecosystem: npm
ingestedAt: '2026-08-21T21:22:19.662Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-63421)

Affected packages:

- `@keystone-6/core <= 6.5.2`

Patched in:

- `@keystone-6/core 6.5.3`

Source: https://github.com/advisories/GHSA-cqmq-8755-7xvh