CVE-2026-49255

Description

### Impact A command injection vulnerability exists in electerm's file system operations (`rmrf`, `mv`, `cp`) in `src/app/lib/fs.js`. These functions construct shell commands by interpolating file paths directly into command strings without escaping shell metacharacters. **Vulnerable functions:** - `rmrf()` - Uses `rm -rf "${path}"` (double quotes, vulnerable to `"` injection) - `mv()` - Uses `mv '${from}' '${to}'` (single quotes, vulnerable to `'` injection) - `cp()` - Uses `cp -r "${from}" "${to}"` (double quotes, vulnerable to `"` injection) **Attack scenario:** 1. Attacker controls a malicious SSH/SFTP server 2. Server lists files with shell metacharacters in names (e.g., `file"$(touch /tmp/pwned)"`) 3. Victim connects to the server and performs file operations (remote-to-local transfer, rename on conflict, etc.) 4. The malicious filename is passed to `rmrf()`, `mv()`, or `cp()` without sanitization 5. Shell metacharacters break out of the quoted argument and execute arbitrary commands **Impact includes:** - Arbitrary command execution as the electerm desktop user - Data exfiltration, malware installation, or system compromise - Both POSIX (bash) and Windows (PowerShell) platforms are affected ### Patches - https://github.com/electerm/electerm/commit/aa778818843b9c083bd711cd04644d102fcb5a42 ### Workarounds If upgrading is not immediately possible, users can mitigate this vulnerability by: 1. Only connecting to trusted SSH/SFTP servers 2. Avoiding remote-to-local file transfers from untrusted sources 3. Not using the "rename on conflict" option when downloading folders from untrusted servers 4. Manually verifying filenames before performing file operations

How to fix CVE-2026-49255

To remediate CVE-2026-49255, upgrade the affected package to a fixed version below.

• —upgrade to 3.11.11 or later

Is CVE-2026-49255 being exploited?

No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-49255.

Affected packages (1)