OS Command Injection in electerm (CVE-2026-49255)
Summary
OS command injection in electerm (CVE-2026-49255). Successful exploitation can lead to full system takeover. Exploitable via rmrf. Mitigation: upgrade to 3.11.11 or later.
Original description
The description as published by the source.
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()- Usesrm -rf "${path}"(double quotes, vulnerable to"injection)mv()- Usesmv '${from}' '${to}'(single quotes, vulnerable to'injection)cp()- Usescp -r "${from}" "${to}"(double quotes, vulnerable to"injection)
Attack scenario:
- Attacker controls a malicious SSH/SFTP server
- Server lists files with shell metacharacters in names (e.g.,
file"$(touch /tmp/pwned)") - Victim connects to the server and performs file operations (remote-to-local transfer, rename on conflict, etc.)
- The malicious filename is passed to
rmrf(),mv(), orcp()without sanitization - 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
Workarounds
If upgrading is not immediately possible, users can mitigate this vulnerability by:
- Only connecting to trusted SSH/SFTP servers
- Avoiding remote-to-local f…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-49255 has been found in electerm.
Attackers can target a specific entry point like rmrf over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade electerm to 3.11.11 or later.
If unsure, ask your IT team or search "electerm CVE-2026-49255" on the vendor's site.
CVE-2026-49255 (electerm) — CWE-78 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: rmrf
Patched: 3.11.11 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
OS command injection (CWE-78) exists in electerm. Attackers reach the vulnerable code path via rmrf without authentication.
Check the vendor advisory for the affected versions of electerm. Attack surface: rmrf.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to 3.11.11.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'electerm' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'electerm' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
electermを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade electerm to 3.11.11ステージング環境で 3.11.11 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- package github.com
- web security-advisories@github.com
- web security-advisories@github.com
- web github.com
- web security-advisories@github.com