CVE-2026-84428

fastify versions before 5.12.2 implement the case-insensitive nature of HTTP header names by lowercasing names in a route's header schema before compiling it, but the transformation is incomplete: it lowercases the properties keys and the root-level required array, and does not lowercase the...

CVE-2026-84428

fastify versions before 5.12.2 are vulnerable to a header validation bypass caused by incomplete case normalization in the JSON Schema Draft 7 dependencies keyword. While the library lowercases property keys and the root-level required array to accommodate HTTP's case-insensitive headers, it fail...