Vulnerabilidad · Publicado 02/09/2026 · Actualizado 03/09/2026
fast-uri no valida el componente de puerto al recomponer la autoridad de una URI, permitiendo que valores no numéricos inyecten delimitadores y redirijan la conexión a hosts controlados por atacantes. Esta vulnerabilidad afecta aplicaciones Node.js en producción que procesen URLs de fuentes no confiables, comprometiendo autenticación y enrutamiento en infraestructuras cloud de LATAM.
fast-uri serializes the port component of a URI without validating it. When recomposing the authority, the userinfo and host components are escaped but the port is concatenated verbatim, so a port value that is not a sequence of digits can inject authority delimiters, demoting the intended host to userinfo and pointing the authority at an attacker-controlled host. Both fast-uri and Node's URL read the result back as the attacker's host with no error, so re-validating the built URI does not catch it. This affects applications that build URIs from parts and assign untrusted data to the port component through the serialize, normalize, or equal functions in their object forms. The issue affects fast-uri versions before 2.4.6, from 3.0.0 before 3.1.7, and from 4.0.0 before 4.1.4. It is fixed in 2.4.6, 3.1.7, and 4.1.4, where recomposeAuthority rejects any port that is not a digit sequence per RFC 3986.
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:H/A:N
CWE-116
Publicado en NIST NVD.