CVE-2026-48798

{
  "id": "CVE-2026-48798",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-18T15:16:54.427",
  "lastModified": "2026-10-22T22:10:00.250",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "SSH.NET is a Secure Shell (SSH) library for .NET. In 2025.1.0 and earlier, ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) trusts file and directory names returned by a remote SCP server and combines them with the requested local directory without containment validation, allowing a malicious, compromised, or man-in-the-middle server to use ../ sequences or absolute paths to create or overwrite files anywhere writable by the client process. This issue is fixed in version 2026.0.0."
    },
    {
      "lang": "es",
      "value": "SSH.NET es una biblioteca Secure Shell (SSH) para .NET. En las versiones 2025.1.0 y anteriores, ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) confía en los nombres de archivo y directorio devueltos por un servidor SCP remoto y los combina con el directorio local solicitado sin validación de contención, permitiendo que un servidor malicioso, comprometido o man-in-the-middle utilice secuencias .. /  o rutas absolutas para crear o sobrescribir archivos en cualquier lugar donde el proceso del cliente tenga permisos de escritura. Este problema se ha solucionado en la versión 2026.0.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "sshnet",
          "product": "SSH.NET",
          "versions": [
            {
              "version": "< 2026.0.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-18T15:28:39.653141Z",
          "id": "CVE-2026-48798",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-73"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/sshnet/SSH.NET/commit/600be0de543765995a189b5d7cd4efac5007f3ce",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/sshnet/SSH.NET/releases/tag/2026.0.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/sshnet/SSH.NET/security/advisories/GHSA-q939-rpr3-3284",
      "source": "[email protected]"
    }
  ]
}