CVE-2021-23597: Fastify Fastify-Multipart

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

This affects the package fastify-multipart before 5.3.1. By providing a name=constructor property it is still possible to crash the application. **Note:** This is a bypass of CVE-2020-8136 (https://security.snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-1290382).

Affected products

• Fastify Fastify-Multipart: before 5.3.1 (fixed in 5.3.1)

Published 2022-02-11. Last modified 2026-06-17.