EUVD-2026-64134
GHSA-cqmq-8755-7xvh
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable GraphQL endpoint requires no auth (PR:N); single crafted query suffices (AC:L); only availability is impacted via unbounded record retrieval.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Blast Radius
ecosystem impact- 5 npm packages depend on @keystone-6/core (5 direct, 0 indirect)
Ecosystem-wide dependent count for version 6.5.3.
DescriptionCVE.org
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.
AnalysisAI
Unauthenticated resource exhaustion in Keystone CMS (Node.js) prior to version 6.5.3 allows any remote GraphQL client to bypass the configured graphql.maxTake record-count limit by supplying a negative take value, since the comparison (take ?? Infinity) > maxTake evaluates to false for negative integers regardless of their magnitude. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target must be running @keystone-6/core prior to version 6.5.3 with the `graphql.maxTake` option configured - without this option, all take values are unbounded by design and the comparison is moot. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 score with vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H accurately reflects real-world risk for publicly exposed deployments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker sends a GraphQL query such as `{ posts(take: -999999) { id title body author { id } } }` to a public-facing Keystone endpoint. The unpatched `(take ?? … |
| Remediation | Upgrade @keystone-6/core to version 6.5.3 or later, which corrects the comparison logic in `findMany` by wrapping the take argument in `Math.abs()` before evaluating it against `graphql.maxTake`. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Keystone CMS instances and identify any running versions prior to 6.5.3; begin planning the upgrade process and testing in a non-production environment. …
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Same weakness CWE-20 – Improper Input Validation
View allSame technique Authentication Bypass
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External POC / Exploit Code
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