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CVE-2026-107161

Estado: Pendiente de análisisAlta (7.5)—

Se ha encontrado un fallo de desbordamiento de búfer basado en heap en Cyrus SASL. La función add_to_challenge() del plugin DIGEST-MD5 calcula el tamaño del búfer necesario para un campo de desafío/respuesta antes de aplicar el entrecomillado de DIGEST-MD5, pero no vuelve a calcular ese tamaño cuando el entrecomillado (escape de caracteres especiales) alarga el valor. El búfer de tamaño insuficiente se pasa después a strcat(), lo que provoca una escritura fuera de límites en el heap cuyo tamaño depende de una entrada controlada por el atacante.

Leer descripción completaMostrar menos

Un servidor DIGEST-MD5 (o HTTP Digest) malicioso o situado en la ruta de comunicación puede desencadenar este fallo en un cliente que se conecte proporcionando un campo de desafío manipulado, como realm o nonce, lo que muy probablemente provocará el bloqueo de la aplicación cliente.

Traducción automática del texto original de NVD (en inglés).

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.

Vector AV:N/AC:H/PR:N/UI:R apunta a T1203 (interacción del usuario requerida). Buffer overflow en DIGEST-MD5 causa crash (DoS) y potencial ejecución de código remota con interacción del servidor malicioso.

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

Application Isolation and SandboxingExploit ProtectionUpdate SoftwareThreat Intelligence ProgramFilter Network TrafficExecution Prevention

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Cyrus — SaslAI

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-107161",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-107161",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2026-10-10T02:42:41.168157Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.6
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          "cpes": [
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          "product": "Red Hat Hardened Images",
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          "defaultStatus": "affected"
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          "cpes": [
            "cpe:/a:redhat:openshift:4"
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          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 4",
          "packageName": "openshift/ose-rhel-coreos-8",
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  "references": [
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      "url": "https://access.redhat.com/security/cve/CVE-2026-107161",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460420",
      "source": "secalert@redhat.com"
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      "url": "http://www.openwall.com/lists/oss-security/2026/10/09/20",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Awaiting Analysis",
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      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters) makes the value longer. The under-sized buffer is then passed to strcat(), causing a heap-based out-of-bounds write whose size depends on attacker-controlled input. A malicious or on-path DIGEST-MD5 (or HTTP Digest) server can trigger this flaw in a connecting client by supplying a crafted challenge field, such as realm or nonce, most likely resulting in a crash of the client application."
    }
  ],
  "lastModified": "2026-10-10T03:17:05.307",
  "sourceIdentifier": "secalert@redhat.com"
}