FKIE_CVE-2026-31870

Vulnerability from fkie_nvd - Published: 2026-03-11 18:16 - Updated: 2026-03-12 21:08
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.1, when a cpp-httplib client uses the streaming API (httplib::stream::Get, httplib::stream::Post, etc.), the library calls std::stoull() directly on the Content-Length header value received from the server with no input validation and no exception handling. std::stoull throws std::invalid_argument for non-numeric strings and std::out_of_range for values exceeding ULLONG_MAX. Since nothing catches these exceptions, the C++ runtime calls std::terminate(), which kills the process with SIGABRT. Any server the client connects to — including servers reached via HTTP redirects, third-party APIs, or man-in-the-middle positions can crash the client application with a single HTTP response. No authentication is required. No interaction from the end user is required. The crash is deterministic and immediate. This vulnerability is fixed in 0.37.1.
References
security-advisories@github.comhttps://github.com/yhirose/cpp-httplib/security/advisories/GHSA-39q5-hh6x-jpxx
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.1, when a cpp-httplib client uses the streaming API (httplib::stream::Get, httplib::stream::Post, etc.), the library calls std::stoull() directly on the Content-Length header value received from the server with no input validation and no exception handling. std::stoull throws std::invalid_argument for non-numeric strings and std::out_of_range for values exceeding ULLONG_MAX. Since nothing catches these exceptions, the C++ runtime calls std::terminate(), which kills the process with SIGABRT. Any server the client connects to \u2014 including servers reached via HTTP redirects, third-party APIs, or man-in-the-middle positions can crash the client application with a single HTTP response. No authentication is required. No interaction from the end user is required. The crash is deterministic and immediate. This vulnerability is fixed in 0.37.1."
    },
    {
      "lang": "es",
      "value": "cpp-httplib es una biblioteca HTTP/HTTPS multiplataforma de un solo archivo y solo de cabecera para C++11. Antes de la versi\u00f3n 0.37.1, cuando un cliente cpp-httplib utiliza la API de streaming (httplib::stream::Get, httplib::stream::Post, etc.), la biblioteca llama directamente a std::stoull() sobre el valor del encabezado Content-Length recibido del servidor sin validaci\u00f3n de entrada y sin manejo de excepciones. std::stoull lanza std::invalid_argument para cadenas no num\u00e9ricas y std::out_of_range para valores que exceden ULLONG_MAX. Dado que nada captura estas excepciones, el tiempo de ejecuci\u00f3n de C++ llama a std::terminate(), lo que termina el proceso con SIGABRT. Cualquier servidor al que se conecte el cliente \u2014incluidos los servidores alcanzados a trav\u00e9s de redirecciones HTTP, APIs de terceros o posiciones de man-in-the-middle\u2014 puede bloquear la aplicaci\u00f3n cliente con una \u00fanica respuesta HTTP. No se requiere autenticaci\u00f3n. No se requiere interacci\u00f3n del usuario final. El bloqueo es determinista e inmediato. Esta vulnerabilidad se corrige en la versi\u00f3n 0.37.1."
    }
  ],
  "id": "CVE-2026-31870",
  "lastModified": "2026-03-12T21:08:22.643",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-11T18:16:26.487",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-39q5-hh6x-jpxx"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-248"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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