Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-77063

Gravedad CVSS v3.1:
BAJA
Tipo:
CWE-362 Ejecución concurrente utilizando recursos compartidos con una incorrecta sincronización (Condición de carrera)
Fecha de publicación:
28/08/2026
Última modificación:
28/08/2026

Descripción

*** Pendiente de traducción *** multer is a middleware for handling multipart/form-data in Node.js. When an application uses an asynchronous fileFilter together with the fileSize limit, a race condition in multer's file stream handling can allow a file that exceeds the configured size limit to bypass the size-limit rejection. All versions before 2.3.0 are affected. The impact is limited because the underlying multipart parser still truncates the stream at the size limit, so this is a bypass of the limit rejection rather than uncontrolled resource consumption. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.