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GHSA-38j7-23hf-9mhc

HighCVSS 7.1 / 10
Published Jul 2, 2026·Last modified Jul 2, 2026
Affected Components(0)

No affected components available

Description

Impact

A path traversal vulnerability exists in the Zmodem and Trzsz file download handlers in electerm. When receiving files via Zmodem or Trzsz protocols, electerm uses the remote-supplied filename directly in path.join() with the user-selected download directory without sanitization.

A malicious SSH server or remote shell process can send a specially crafted filename such as ../escaped.txt to escape the user-selected download directory and write files to arbitrary locations on the user's filesystem, subject to process permissions.

Attack scenario:

  1. User connects to a malicious SSH server
  2. Attacker initiates a Zmodem or Trzsz file transfer
  3. Attacker supplies a traversal filename (e.g., ../../.bashrc, ../escaped.txt)
  4. User accepts the transfer and selects a download directory
  5. File is written outside the selected directory, potentially overwriting sensitive files

Affected components:

  • src/app/server/zmodem.js - prepareReceiveFile() at line 736
  • src/app/server/trzsz.js - getUniqueFilePath() at line 559, openSaveFile() callback, and savedFilePaths mapping

Patches

  • https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284

Workarounds

If upgrading is not immediately possible, users can mitigate this vulnerability by:

  1. Only connecting to trusted SSH servers
  2. Rejecting or canceling any incoming Zmodem or Trzsz file transfers from untrusted sources
  3. Avoiding the use of Zmodem (sz/rz) and Trzsz (trz/tsz) commands on untrusted servers
Risk Scores
Base Score
7.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data. There is a low impact on the availability of the system.

Threat Intelligence
6.5

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-49253
    Alias

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