CVE-2026-49253Patch

LOWCVSS 7.1 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-22

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Full discourse1 post

DFIR Lab@DFIR_Lab46d
Patch
🚨 HIGH severity CVE-2026-49253 (CVSS 7.1) affects electerm terminal client <3.11.11. Path traversal flaw allows malicious SSH servers to write files outside intended directories via Zmodem/Trzsz transfers. Update immediately. #CVE #Vulnerability #PatchNow https://t.co/ar5uI7oXFe
Post summary
CVE-2026-49253 is a High severity path traversal vulnerability in electerm terminal client versions below 3.11.11, allowing malicious SSH servers to write files outside intended directories via Zmodem/Trzsz transfers; users are urged to update immediately to mitigate the risk.
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