CVE-2026-43969
Gravedad CVSS v4.0:
BAJA
Tipo:
CWE-93
Neutralización incorrecta de secuencias de retornos de carro y saltos de linea (CRLF)
Fecha de publicación:
11/05/2026
Última modificación:
11/05/2026
Descripción
*** Pendiente de traducción *** Improper Neutralization of CRLF Sequences (&#39;CRLF Injection&#39;) vulnerability in ninenines cowlib allows HTTP request splitting and cookie smuggling via unvalidated cookie name and value fields.<br />
<br />
cow_cookie:cookie/1 in cowlib builds a client-side Cookie: request header from a list of name-value pairs without validating either field. An attacker who controls the cookie names or values passed to this function can inject ;, ,, CR, LF, or TAB characters into the serialized header. This enables two classes of attack: cookie smuggling within a single header (e.g. injecting "; admin=1" to introduce a phantom cookie that the receiving server treats as authentic) and HTTP request header splitting (injecting CRLF to append arbitrary headers or smuggle a complete second request against a shared upstream proxy). The decoder side (parse_cookie_name/1, parse_cookie_value/1) and setcookie/3 already validate and reject these characters; the encoder alone is missing the check.<br />
<br />
This issue affects cowlib from 2.9.0.
Impacto
Puntuación base 4.0
2.10
Gravedad 4.0
BAJA