CVE-2026-49253

{
  "id": "CVE-2026-49253",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-19T15:17:06.747",
  "lastModified": "2026-10-27T13:10:00.360",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "electerm is an open-sourced terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp client. Prior to 3.11.11, electerm uses remote-supplied filenames directly with path.join() while receiving Zmodem and Trzsz transfers. In src/app/server/zmodem.js, prepareReceiveFile() joins the filename to the user-selected save path, and in src/app/server/trzsz.js, getUniqueFilePath(), the openSaveFile() callback, and the savedFilePaths mapping construct destinations without sanitization. A malicious SSH server or remote shell can provide a filename containing traversal components such as ../escaped.txt or ../../.bashrc. When the victim accepts the transfer and selects a download directory, electerm can write outside that directory and overwrite files accessible to the desktop user, potentially changing sensitive configuration or impairing availability. This issue is fixed in version 3.11.11."
    },
    {
      "lang": "es",
      "value": "electerm es un cliente de terminal/ssh/sftp/telnet/puerto serie/RDP/VNC/Spice/ftp de código abierto. Antes de la versión 3.11.11, electerm utiliza nombres de archivo proporcionados remotamente directamente con path.join() al recibir transferencias Zmodem y Trzsz. En src/app/server/zmodem.js, prepareReceiveFile() une el nombre de archivo a la ruta de guardado seleccionada por el usuario, y en src/app/server/trzsz.js, getUniqueFilePath(), la devolución de llamada openSaveFile() y la asignación savedFilePaths construyen destinos sin saneamiento. Un servidor SSH malicioso o shell remoto puede proporcionar un nombre de archivo que contiene componentes de recorrido como .. / escaped.txt o .. / .. / .bashrc. Cuando la víctima acepta la transferencia y selecciona un directorio de descarga, electerm puede escribir fuera de ese directorio y sobrescribir archivos accesibles para el usuario de escritorio, potencialmente cambiando la configuración sensible o afectando la disponibilidad. Este problema está solucionado en la versión 3.11.11."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "electerm",
          "product": "electerm",
          "versions": [
            {
              "version": "< 3.11.11",
              "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": "2026-08-21T19:31:22.919563Z",
          "id": "CVE-2026-49253",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/electerm/electerm/releases/tag/v3.11.11",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}