5.3.1

⚠️ Security Release ⚠️

• Fix for "Invalid content-type parsing could lead to validation bypass" and CVE-2025-32442

What's Changed

• test: migrate logger options to node test runner by @ilteoood in https://github.com/fastify/fastify/pull/6059
• test: migrate logger logging to node test runner by @ilteoood in https://github.com/fastify/fastify/pull/6060
• test: convert custom parser 1 to node test runner by @ilteoood in https://github.com/fastify/fastify/pull/6053
• test: custom querystring parser by @ilteoood in https://github.com/fastify/fastify/pull/6054
• test: migrate stream 4 to node test runner by @ilteoood in https://github.com/fastify/fastify/pull/6062
• test: migrate request logger to node test runner by @ilteoood in https://github.com/fastify/fastify/pull/6058
• test: migrate custom parser 0 to node test runner by @ilteoood in https://github.com/fastify/fastify/pull/6052
• test: migrate logger instantiation to node test runner by @ilteoood in https://github.com/fastify/fastify/pull/6061

Full Changelog: https://github.com/fastify/fastify/compare/v5.3.0...v5.3.1