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

CVE-2026-5079

Gravedad CVSS v3.1:
ALTA
Tipo:
CWE-400 Consumo de recursos no controlado (Agotamiento de recursos)
Fecha de publicación:
15/06/2026
Última modificación:
16/06/2026

Descripción

*** Pendiente de traducción *** Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.<br /> <br /> Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.<br /> <br /> Workarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Productos y versiones vulnerables

CPE Desde Hasta
cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:* 1.0.0 (incluyendo) 2.2.0 (excluyendo)
cpe:2.3:a:expressjs:multer:3.0.0:alpha1:*:*:*:node.js:*:*