CVE-2026-63421 json
Keystone: `graphql.maxTake` bypass with negative `take`
published 2mo ago modified 30d ago also EUVD-2026-64134 , GHSA-cqmq-8755-7xvh
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
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 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.
Patch / fix
- npm @keystone-6/core 6.5.3
- keystonejs keystone 6.5.3
Is CVE-2026-63421 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @keystone-6/core | <6.5.3 |
6.5.3 |
Affected products
- keystonejs keystone
Classification
References
-
github.com
/keystonejs/keystone/pull/9859
web
-
github.com
/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1
web
-
github.com
/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh
web
-
github.com
/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3
web
-
github.com
/keystonejs/keystone
package
Sources
- CVE List CVE-2026-63421
- GitHub Advisory GHSA-cqmq-8755-7xvh
- NVD CVE-2026-63421
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.