Vulnerabilidad · Publicado 28/08/2026 · Actualizado 29/08/2026
multer, middleware de Node.js para procesar multipart/form-data, presenta una vulnerabilidad en la versión 2.2.0 donde las cargas abortadas o truncadas no cierran correctamente los descriptores de archivo, dejándolos abiertos en el sistema. Esto permite a atacantes remotos consumir recursos del servidor y potencialmente acceder a información sensible. El riesgo es alta en aplicaciones web que manejan uploads de usuarios sin autenticación robusta.
multer is a middleware for handling multipart/form-data in Node.js. In version 2.2.0, when a disk-backed upload is aborted or truncated before the write stream finishes, multer's disk storage engine removes the visible file but does not close the underlying write file descriptor, leaving a deleted but still open descriptor. A remote attacker able to reach an upload route using the built-in disk storage can send repeated aborted or malformed multipart uploads, each one leaking a file descriptor and retaining disk blocks until the process exits, which can exhaust resources and cause a denial of service. The issue is fixed in multer 2.3.0, which closes the destination write stream on abnormal source termination and defers cleanup until the stream has closed. 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-400, CWE-459
Publicado en NIST NVD.