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CVE-2026-49253— electerm: Path Traversal in Zmodem and Trzsz Download Filename Handling

Quick assessment

Affected
electerm electerm
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

electerm是electerm组织的一款终端仿真程序。 electerm 3.11.11之前版本存在安全漏洞，该漏洞源于接收Zmodem和Trzsz传输时未对远程提供的文件名进行清理，直接与路径拼接，可能导致路径遍历，允许恶意SSH服务器或远程shell覆盖文件，更改敏感配置或影响可用性。

CVSS 7.1 · High EPSS 0.34% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
electerm electerm < 3.11.11 affected
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I. Basic Information for CVE-2026-49253

Vulnerability Information
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Vulnerability Title
electerm: Path Traversal in Zmodem and Trzsz Download Filename Handling
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
electerm 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
electerm是electerm组织的一款终端仿真程序。 electerm 3.11.11之前版本存在安全漏洞，该漏洞源于接收Zmodem和Trzsz传输时未对远程提供的文件名进行清理，直接与路径拼接，可能导致路径遍历，允许恶意SSH服务器或远程shell覆盖文件，更改敏感配置或影响可用性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
electerm electerm < 3.11.11 -

II. Public POCs for CVE-2026-49253

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10416 chars
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III. Intelligence Information for CVE-2026-49253

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Patches & Fixes for CVE-2026-49253 (1)

Vendor Advisories for CVE-2026-49253 (1)

Vendor Pages for CVE-2026-49253 (1)

IV. Related Vulnerabilities

Same product: electerm
Same vendor: electerm
Same weakness: CWE-22

V. Comments for CVE-2026-49253

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