CVE-2026-63421
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk51th percentile - higher than 51% of all known CVEs
Summary
Keystone, a content management system for Node.js, prior to version 6.5.3, contains a vulnerability in the findMany resolver that allows 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 intended, potentially exhausting service resources. This issue is fixed in version 6.5.3.
Risk Assessment
An attacker can retrieve excessive amounts of data, potentially leading to service overload and resource exhaustion, affecting system availability.
Recommendation
It is recommended to immediately upgrade Keystone to version 6.5.3 or later to eliminate the vulnerability.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS