CVE-2026-19481 @fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header

@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as proto or constructor. The internal header parser stores headers in a...

CVE-2026-19481

Summary: CVE-2026-19481 affects the multipart-form data parser in the @fastify/busboy package (versions 1.0.0–3.2.0). An attacker can submit multipart data with a part header named after a prototype-inherited property (e.g., proto , constructor), causing the header parser (which stores headers in...

Uncaught Exception

Overview Affected versions of this package are vulnerable to Uncaught Exception due to an error event thrown by busboy. An attacker can cause a full nodejs application to crash by sending a specially crafted multi-part upload request. PoC javascript const express = require'express' const multer =...

Node.js: Denial of Service by resource exhaustion CWE-400 due to unfinished HTTP/1.1 requests

Summary: Node.js is vulnerable to HTTP denial of service DOS attacks based on delayed requests submission which can make the server unable to accept new connections. Description: An attacker can open an arbitrary number of HTTP connections and keep the server busy by never completing the request...

Node.js third-party modules: Prototype pollution in multipart parsing

I would like to report a prototype pollution attack in fastify-multipart it allows to crash a remote server parsing multipart requests by sending a specially crafted request. Module module name: fastify-multipart version: all versions before Detailed steps to reproduce with all required...