fastify vulnerable to request body replacement via an async validation result collision

Impact Fastify runs a route's validator and, for a result shaped like value, error , unwraps it: an error becomes a validation failure and value replaces the request part. This convention is intended for synchronous custom compilers for example Joi. A JSON Schema $async validator, however, resolv...

NPM: fastify vulnerable to request body replacement via an async validation result collision

NPM: fastify vulnerable to request body replacement via an async validation result collision vulnerability discovered by ? in WordPress Npm fastify versions 5.12.2...

CVE-2026-84504 fastify vulnerable to request body replacement via an async validation result collision

fastify versions before 5.12.2 treat the object resolved by a successful Ajv async validator as the value result protocol used by custom validator compilers. If a request that passes its route schema contains a property named value at the root, fastify replaces the entire request body with that...

CVE-2026-84504 fastify vulnerable to request body replacement via an async validation result collision

fastify versions before 5.12.2 treat the object resolved by a successful Ajv async validator as the value result protocol used by custom validator compilers. If a request that passes its route schema contains a property named value at the root, fastify replaces the entire request body with that...

CVE-2026-84504 fastify vulnerable to request body replacement via an async validation result collision

fastify versions before 5.12.2 treat the object resolved by a successful Ajv async validator as the value result protocol used by custom validator compilers. If a request that passes its route schema contains a property named value at the root, fastify replaces the entire request body with that...