CVE-2025-32442: Fastify

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Fastify is a fast and low overhead web framework, for Node.js. In versions 5.0.0 to 5.3.0 as well as version 4.29.0, applications that specify different validation strategies for different content types have a possibility to bypass validation by providing a _slightly altered_ content type such as with different casing or altered whitespacing before `;`. This was patched in v5.3.1, but the initial patch did not cover all problems. This has been fully patched in v5.3.2 and v4.29.1. A workaround involves not specifying individual content types in the schema.

Affected products

• Fastify Fastify: from 5.0.0, before 5.3.2 (fixed in 5.3.2); version 4.29.0 only

Published 2025-04-18. Last modified 2026-06-17.