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CVE-2026-28434

Estado: AnalizadaMedia (5.3)—

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, when a request handler throws a C++ exception and the application has not registered a custom exception handler via set_exception_handler(), the library catches the exception and writes its message directly into the HTTP response as a header named EXCEPTION_WHAT. This header is sent to whoever made the request, with no authentication check and no special configuration required to trigger it. The behavior is on by default. A developer who does not know to opt in to set_exception_handler() will ship a server that leaks internal exception messages to any client. This vulnerability is fixed in 0.35.0.

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 (1)

Yhirose — Cpp-httplib

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-28434",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "ssvcData": {
          "id": "CVE-2026-28434",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-04T20:45:05.207964Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
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  "affected": [
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      "affectedData": [
        {
          "vendor": "yhirose",
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          "versions": [
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  "published": "2026-03-04T20:16:19.823",
  "references": [
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      "url": "https://github.com/yhirose/cpp-httplib/commit/defd907c7469c5c8281247b73bbd07be24c31164",
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  "descriptions": [
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      "lang": "en",
      "value": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, when a request handler throws a C++ exception and the application has not registered a custom exception handler via set_exception_handler(), the library catches the exception and writes its message directly into the HTTP response as a header named EXCEPTION_WHAT. This header is sent to whoever made the request, with no authentication check and no special configuration required to trigger it. The behavior is on by default. A developer who does not know to opt in to set_exception_handler() will ship a server that leaks internal exception messages to any client. This vulnerability is fixed in 0.35.0."
    },
    {
      "lang": "es",
      "value": "cpp-httplib es una librería HTTP/HTTPS multiplataforma de un solo archivo de solo encabezado C++11. Antes de la versión 0.35.0, cuando un gestor de solicitudes lanza una excepción de C++ y la aplicación no ha registrado un gestor de excepciones personalizado a través de set_exception_handler(), la librería captura la excepción y escribe su mensaje directamente en la respuesta HTTP como un encabezado llamado EXCEPTION_WHAT. Este encabezado se envía a quienquiera que haya realizado la solicitud, sin verificación de autenticación y sin necesidad de configuración especial para activarlo. El comportamiento está activado por defecto. Un desarrollador que no sabe cómo optar por set_exception_handler() distribuirá un servidor que filtra mensajes de excepción internos a cualquier cliente. Esta vulnerabilidad se corrige en la versión 0.35.0."
    }
  ],
  "lastModified": "2026-06-17T10:28:38.347",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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