Fastify

Fastify is a widely embedded Node.js web framework that powers a niche but prominent slice of modern web services, with a small focused product portfolio centered on the core framework and its middleware ecosystem including static file serving, multipart handling, and request proxying. Vulnerabilities affecting the vendor skew strongly toward critical-severity outcomes and recur through weakness classes reflecting HTTP parsing and resource-handling complexity: CSRF protection gaps, interpretation conflicts between the framework and upstream components, and uncontrolled resource consumption stemming from insufficient input validation and rate-limiting. The exposure pattern—particularly around URL encoding interpretation, multipart processing, and denial-of-service vectors—arises from the framework's position at the application boundary where malformed or adversarial requests can propagate directly into application logic. Defenders deploying Fastify should prioritize framework and plugin updates and validate middleware configurations for CSRF tokens, request size limits, and parser strictness; live severity and exploitation counts are shown alongside this summary.