CVE-2026-49253

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.

CVSS 3.1

7.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

EPSS

0.4% chance of exploitation in the next 30 days; higher than 37% of CVEs (scores of 2026-10-26)

CWE

CWE-22

Published

2026-08-19

Modified

2026-10-27

Record from

the NVD, synced 2026-10-27

Packages (OSV)

References

• https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284
• https://github.com/electerm/electerm/releases/tag/v3.11.11
• https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc
• https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc

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