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CVE-2023-32681

Estado: ModificadaMedia (6.1)—

Requests is a HTTP library. Since Requests 2.3.0, Requests has been leaking Proxy-Authorization headers to destination servers when redirected to an HTTPS endpoint. This is a product of how we use `rebuild_proxies` to reattach the `Proxy-Authorization` header to requests. For HTTP connections sent through the tunnel, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the `Proxy-Authorization` header must be sent in the CONNECT request as the proxy has no visibility into the tunneled request.

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This results in Requests forwarding proxy credentials to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate sensitive information. This issue has been patched in version 2.31.0.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Fedoraproject — FedoraPython — Requests

CWE

Referencias

JSON original (NVD)

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      "value": "Requests is a HTTP library. Since Requests 2.3.0, Requests has been leaking Proxy-Authorization headers to destination servers when redirected to an HTTPS endpoint. This is a product of how we use `rebuild_proxies` to reattach the `Proxy-Authorization` header to requests. For HTTP connections sent through the tunnel, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the `Proxy-Authorization` header must be sent in the CONNECT request as the proxy has no visibility into the tunneled request. This results in Requests forwarding proxy credentials to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate sensitive information. This issue has been patched in version 2.31.0."
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      "value": "Requests es una librería HTTP. Desde Requests 2.3.0, Requests ha estado filtrando cabeceras Proxy-Authorization a los servidores de destino cuando se redirige a un endpoint HTTPS. Esto es producto de cómo usamos `rebuild_proxies` para volver a adjuntar la cabecera `Proxy-Authorization` a las peticiones. Para conexiones HTTP enviadas a través del túnel, el proxy identificará la cabecera en la propia petición y la eliminará antes de reenviarla al servidor de destino. Sin embargo, cuando se envía a través de HTTPS, la cabecera `Proxy-Authorization` debe enviarse en la solicitud CONNECT, ya que el proxy no tiene visibilidad sobre la solicitud en túnel. Esto provoca que las solicitudes reenvíen las credenciales del proxy al servidor de destino de forma no intencionada, lo que permite a un actor malicioso filtrar información confidencial. Este problema se ha corregido en la versión 2.31.0."
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  "lastModified": "2026-06-17T05:59:22.687",
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