Vulnerabilidad · Publicado 28/08/2026 · Actualizado 29/08/2026
multer, middleware estándar para procesar datos multipart/form-data en Node.js, contiene una vulnerabilidad que causa RangeError no controlado al recibir solicitudes especialmente crafteadas con nombres de campos numéricos malformados. Un atacante puede terminar abruptamente el proceso Node.js, afectando disponibilidad de plataformas digitales en empresas mexicanas y latinoamericanas que usan este componente en APIs de carga de archivos.
multer is a middleware for handling multipart/form-data in Node.js. A small multipart request containing two specially crafted text field names can cause an uncaught RangeError (Invalid array length) that terminates the Node.js process. The first field uses a very large numeric array index to allocate a maximum-length sparse array, and a second field then pushes past that length, which throws inside the append-field dependency and is not caught by multer. All versions before 2.3.0 are affected, and the issue is a remotely triggerable denial of service. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
Score: 7.5/10 — Severidad: HIGH — Estado NIST: Received
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-248
Publicado en NIST NVD.