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CVE-2026-23739

Estado: AnalizadaMedia (6.5)—

Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, the ast_xml_open() function in xml.c parses XML documents using libxml with unsafe parsing options that enable entity expansion and XInclude processing.

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Specifically, it invokes xmlReadFile() with the XML_PARSE_NOENT flag and later processes XIncludes via xmlXIncludeProcess().If any untrusted or user-supplied XML file is passed to this function, it can allow an attacker to trigger XML External Entity (XXE) or XInclude-based local file disclosure, potentially exposing sensitive files from the host system. This can also be triggered in other cases in which the user is able to supply input in xml format that triggers the asterisk process to parse it. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.

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)

Sangoma — AsteriskSangoma — Certified Asterisk

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-23739",
  "cveTags": [],
  "metrics": {
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          "id": "CVE-2026-23739",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
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              "technicalImpact": "partial"
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          ],
          "version": "2.0.3",
          "timestamp": "2026-02-06T17:36:34.440710Z"
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          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
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          "privilegesRequired": "HIGH",
          "confidentialityImpact": "NONE"
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  "published": "2026-02-06T17:16:26.147",
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      "url": "https://github.com/asterisk/asterisk/security/advisories/GHSA-85x7-54wr-vh42",
      "tags": [
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      "description": [
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          "value": "CWE-611"
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      "lang": "en",
      "value": "Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, the ast_xml_open() function in xml.c parses XML documents using libxml with unsafe parsing options that enable entity expansion and XInclude processing. Specifically, it invokes xmlReadFile() with the XML_PARSE_NOENT flag and later processes XIncludes via xmlXIncludeProcess().If any untrusted or user-supplied XML file is passed to this function, it can allow an attacker to trigger XML External Entity (XXE) or XInclude-based local file disclosure, potentially exposing sensitive files from the host system. This can also be triggered in other cases in which the user is able to supply input in xml format that triggers the asterisk process to parse it. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2."
    },
    {
      "lang": "es",
      "value": "Asterisk es una centralita privada de código abierto y un kit de herramientas de telefonía. Antes de las versiones 20.7-cert9, 20.18.2, 21.12.1, 22.8.2 y 23.2.2, la función ast_xml_open() en xml.c analiza documentos XML usando libxml con opciones de análisis inseguras que permiten la expansión de entidades y el procesamiento de XInclude. Específicamente, invoca xmlReadFile() con la bandera XML_PARSE_NOENT y posteriormente procesa XIncludes a través de xmlXIncludeProcess(). Si cualquier archivo XML no confiable o proporcionado por el usuario se pasa a esta función, puede permitir a un atacante activar una Entidad Externa XML (XXE) o una divulgación de archivos locales basada en XInclude, exponiendo potencialmente archivos sensibles del sistema anfitrión. Esto también puede ser activado en otros casos en los que el usuario puede proporcionar entrada en formato XML que activa el proceso de Asterisk para analizarla. Este problema ha sido parcheado en las versiones 20.7-cert9, 20.18.2, 21.12.1, 22.8.2 y 23.2.2."
    }
  ],
  "lastModified": "2026-06-17T10:22:01.557",
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}