🛡️ CVE-2026-43943 — electerm

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-78 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Electerm Security Vulnerability: RCE via malicious SSH server filename in openFileWithEditor

Impact

A code execution (RCE) vulnerability exists in electerm's SFTP open with system editor or "Edit with custom editor" feature. When a user opts to edit a file using open with system editor or open with a custom editor, the filename is passed directly into a command line without sanitization.

A malicious actor controlling the SSH server or user OS can exploit this by crafting a filename containing shell metacharacters. If a victim subsequently attempts to edit this file, the injected commands are executed on their machine with the user's privileges. This could allow the attacker to run arbitrary code, install malware, or move laterally within the network.

<img width="1792" height="817" alt="1" src="https://github.com/user-attachments/assets/ddf78890-e95d-4fe7-981e-f86887677e8b" />

<img width="1648" height="941" alt="2" src="https://github.com/user-attachments/assets/cca2295b-2053-4d99-a464-be51eac2f5be" />

Patches

Fixed in version >= 3.7.9

  • https://github.com/electerm/electerm/commit/24ce7103e264cffe6eb5476c0506a2379e6f8333

Workarounds

Until a patch is available, it is strongly recommended to:

  • Refrain from using the open with system editor or "Edit with custom editor" feature when connected to untrusted or unfamiliar SSH servers.
  • Consider using the built-in editor for viewing files, as this path may not be vulnerable to the same injection.
  • If the feature must be used, ensure connections are exclusively established with trusted servers and perform rigorous filename validation before editing.

Resources

  • [electerm GitHub Repository](https://github.com/electerm/electerm)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-43943 is classified as CWE-78: OS Command Injection. Untrusted input reaches a shell command without neutralisation, so an attacker can run arbitrary operating system commands.

Affected software

CVE-2026-43943 is recorded against 1 package.

  • electerm

Timeline and source

Published on 8 May 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-78
Public Exploit ✅ No
Source OSV
Published 2026-05-08
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
electerm — —

Similar Threats

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