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Vulnerabilidades de python-h2

Vulnerabilidades publicadas para python-h2 en los últimos 30 días: 0. Incluidas en el catálogo KEV: 0.

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Vulnerabilidades: 2

  1. CVE-2026-71554

    Media · CVSS 5.3EPSS 0,42%Sin corrección publicada

    h2: Duplicate Host header could facilitate request smuggling

    h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request carries two Host header lines, providing a request smuggling primitive. This issue is fixed in version 4.4.1.

    Publicación Actualización
  2. CVE-2025-57804

    Media · CVSS 6.9EPSS 1,88%Sin corrección publicada

    h2 allows HTTP Request Smuggling due to illegal characters in headers

    h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request boundaries and bypass security controls. This issue has been patched in version 4.3.0.

    Publicación Actualización

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