{"id":"CVE-2026-49253","sourceIdentifier":"security-advisories@github.com","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":"security-advisories@github.com","affectedData":[{"vendor":"electerm","product":"electerm","versions":[{"version":"< 3.11.11","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","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":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-22"}]}],"references":[{"url":"https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284","source":"security-advisories@github.com"},{"url":"https://github.com/electerm/electerm/releases/tag/v3.11.11","source":"security-advisories@github.com"},{"url":"https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc","source":"security-advisories@github.com"},{"url":"https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}