CVE-2026-84469

CVE-2026-84469 · fastify vulnerable to request validation bypass via skipped boolean false schemas

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fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance. When an application assigns false to a route's body, querystring, params, or headers schema to deny all input, fastify treats it as a missing schema, compiles no validator, and runs the route handler on any request. An unauthenticated remote client can therefore reach a handler that a valid deny-all schema was intended to make unreachable, a complete validation bypass that can lead to unauthorized state changes or execution of disabled operations. Users should upgrade to fastify 5.12.2 or later.

CVSS 7.5 · Élevée · EPSS 0,5% · Correctif disponible

Publication

2026-09-04T09:59:36.406Z

Mise à jour

2026-09-04T19:34:13.735Z

Pile logicielle: node

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