CVE-2026-18504

fastify versions before 5.12.1 suffer a schema validation bypass: when a route schema targets a root primitive (e.g., integer), Ajv coerces the input type but Fastify passes the original uncoerced value to handlers, letting invalid data reach application logic. Upgrade to 5.12.1; no workarounds e...

PT-2026-77312

Name of the Vulnerable Software and Affected Versions fastify versions prior to 5.12.1 Description A schema validation bypass occurs when a request body schema targets a root primitive value. When validating a top-level primitive, such as an integer, Ajv a JSON schema validator may coerce a JSON...