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CVE-2026-21428

Estado: AnalizadaAlta (7.7)—

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.0, the ``write_headers`` function does not check for CR & LF characters in user supplied headers, allowing untrusted header value to escape header lines. This vulnerability allows attackers to add extra headers, modify request body unexpectedly & trigger an SSRF attack. When combined with a server that supports http1.1 pipelining (springboot, python twisted etc), this can be used for server side request forgery (SSRF). Version 0.30.0 fixes this issue.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Inyección de cabeceras HTTP sin validación en librería de red accesible remotamente (AV:N, PR:N). Los atacantes pueden forzar SSRF y manipular solicitudes, logrando proxy no autorizado y alteración de datos en tránsito.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningSSL/TLS InspectionPrivileged Account ManagementNetwork SegmentationNetwork Intrusion Prevention

Tecnologías afectadas (1)

Yhirose — Cpp-httplib

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-21428",
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          "integrityImpact": "HIGH",
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          "valueDensity": "NOT_DEFINED",
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          "modifiedAttackVector": "NOT_DEFINED",
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          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
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          "modifiedAttackRequirements": "NOT_DEFINED",
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          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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  "published": "2026-01-01T18:15:41.057",
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  "vulnStatus": "Analyzed",
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      "description": [
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        }
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      "lang": "en",
      "value": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.0, the ``write_headers`` function does not check for CR & LF characters in user supplied headers, allowing untrusted header value to escape header lines.\nThis vulnerability allows attackers to add extra headers, modify request body unexpectedly & trigger an SSRF attack. When combined with a server that supports http1.1 pipelining (springboot, python twisted etc), this can be used for server side request forgery (SSRF). Version 0.30.0 fixes this issue."
    },
    {
      "lang": "es",
      "value": "cpp-httplib es una biblioteca HTTP/HTTPS multiplataforma de un solo archivo de cabecera C++11. Antes de la versión 0.30.0, la función 'write_headers' no verifica la presencia de caracteres CR y LF en las cabeceras proporcionadas por el usuario, lo que permite que un valor de cabecera no confiable escape las líneas de cabecera. Esta vulnerabilidad permite a los atacantes añadir cabeceras adicionales, modificar el cuerpo de la solicitud de forma inesperada y desencadenar un ataque SSRF. Cuando se combina con un servidor que soporta el pipelining de http1.1 (springboot, python twisted, etc.), esto puede utilizarse para la falsificación de solicitudes del lado del servidor (SSRF). La versión 0.30.0 corrige este problema."
    }
  ],
  "lastModified": "2026-06-17T10:18:39.177",
  "configurations": [
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