Electerm up to 3.11.10 Zmodem Transfer/Trzsz Transfer src/app/server/zmodem.js prepareReceiveFile/getUniqueFilePath/openSaveFile path traversal

Summaryinfo

A vulnerability has been found in Electerm up to 3.11.10 and classified as problematic. Affected is the function prepareReceiveFile/getUniqueFilePath/openSaveFile of the file src/app/server/zmodem.js of the component Zmodem Transfer/Trzsz Transfer. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-49253. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Electerm up to 3.11.10. This issue affects the function prepareReceiveFile/getUniqueFilePath/openSaveFile of the file src/app/server/zmodem.js of the component Zmodem Transfer/Trzsz Transfer. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-49253 since 05/28/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 3.11.11 eliminates this vulnerability.

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Productinfo

Name

• Electerm

Version

• 3.11.0
• 3.11.1
• 3.11.2
• 3.11.3
• 3.11.4
• 3.11.5
• 3.11.6
• 3.11.7
• 3.11.8
• 3.11.9
• 3.11.10

Website

• Product: https://github.com/electerm/electerm/

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