---
id: CVE-2026-49253
title: >-
  electerm is an open-sourced
  terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp client
summary: >-
  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/z…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L'
cwe:
  - CWE-22
vendor: electerm
product: electerm
affected:
  - electerm <= 3.11.0
patched:
  - electerm 3.11.11
published: '2026-08-19'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:13:25.910'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49253'
references:
  - url: >-
      https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284
    label: security-advisories@github.com
  - url: 'https://github.com/electerm/electerm/releases/tag/v3.11.11'
    label: security-advisories@github.com
  - url: >-
      https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc
    label: security-advisories@github.com
  - url: >-
      https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-38j7-23hf-9mhc'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00439
epssPercentile: 0.35473
ecosystem: npm
ingestedAt: '2026-07-02T19:41:50.941Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-49253)

Affected packages:

- `electerm <= 3.11.0`

Patched in:

- `electerm 3.11.11`

Source: https://github.com/advisories/GHSA-38j7-23hf-9mhc