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.

A vulnerability in Keystone CMS for Node.js (prior to version 6.5.3) allows remote unauthenticated attackers to bypass the configured GraphQL query limit. The flaw exists in the findMany resolver, which compares a signed take argument directly against graphql.maxTake without validating for negative values. By supplying a negative take value with a large magnitude, an attacker can circumvent the configured record limit. This bypass also extends to relationship queries, potentially allowing retrieval of more records than intended by the developer. The impact includes potential resource exhaustion and denial of service. No authentication is required to exploit this vulnerability. The issue has been patched in Keystone version 6.5.3. A fix was committed to the keystonejs/keystone GitHub repository. Developers using affected versions are advised to upgrade immediately.