CVE-2026-84469

fastify versions before 5.12.2 use JavaScript truthiness to decide whether to compile a request schema. Because JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance, an application that assigns false to a route's body, querystring, params, or headers schema ...

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

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...

Phoenix: Presence keys colliding with `Object.prototype` members break existence checks

Summary The Phoenix JavaScript presence client assets/js/phoenix/presence.js tests whether a presence already exists using a bare truthiness check statekey rather than an own-property check. Because applications commonly track presences under a client-supplied username or id, the presence key can...