CVE-2022-41919: Fastify

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Fastify is a web framework with minimal overhead and plugin architecture. The attacker can use the incorrect `Content-Type` to bypass the `Pre-Flight` checking of `fetch`. `fetch()` requests with Content-Type’s essence as "application/x-www-form-urlencoded", "multipart/form-data", or "text/plain", could potentially be used to invoke routes that only accepts `application/json` content type, thus bypassing any CORS protection, and therefore they could lead to a Cross-Site Request Forgery attack. This issue has been patched in version 4.10.2 and 3.29.4. As a workaround, implement Cross-Site Request Forgery protection using `@fastify/csrf'.

Affected products

• Fastify Fastify: from 3.0.0, before 3.29.4 (fixed in 3.29.4); from 4.0.0, before 4.10.2 (fixed in 4.10.2)

Published 2022-11-22. Last modified 2026-06-17.