CVE-2026-53542 — Termix is a web-based server management platform with SSH terminal, tunneling, and file…¶

Key facts

CVE-2026-53542 is a High (8.8) vulnerability: Termix is a web-based server management platform with SSH terminal, tunneling, and file…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-53542
Severity	High (8.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-53542/

Details¶

English | 한국어

Description¶

Termix is a web-based server management platform with SSH terminal, tunneling, and file editing capabilities. Prior to 2.3.2, the archive creation endpoint in src/backend/ssh/file-manager.ts passes selected file basenames to tar without an end-of-options marker and without making the operands unambiguously relative. A user with access to an SSH file-manager session can select basenames beginning with GNU tar options such as --checkpoint=1 and --checkpoint-action=exec, causing tar, tar.gz, tar.bz2, or tar.xz creation to interpret those names as options. The resulting checkpoint action executes commands on the managed SSH host with the privileges of the connected SSH account, allowing file disclosure, modification, and service disruption. This issue is fixed in version 2.3.2.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-53542
Type	RCE
CVSS Score	8.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-53542/poc.py

Usage¶

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab¶

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start¶

# Clone and navigate to CVE directory
cd CVE-2026-53542

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints¶

Application	URL	Status
Vulnerable App	http://localhost:8080	Shows vulnerability
Patched App	http://localhost:8081	Demonstrates fix

Directory Structure¶

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References¶

https://github.com/Termix-SSH/Termix/commit/52f4e51ae03b5b8d2608e1383e2ccf79d290132b
https://github.com/Termix-SSH/Termix/pull/874
https://github.com/Termix-SSH/Termix/releases/tag/release-2.3.2-tag
https://github.com/Termix-SSH/Termix/security/advisories/GHSA-rwj6-6vh7-45pv

Generated by PoC Generator on 2026-08-23T18:40:39.97894089

Frequently asked questions¶

What is CVE-2026-53542?¶

CVE-2026-53542 is a High (8.8) vulnerability: Termix is a web-based server management platform with SSH terminal, tunneling, and file…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-53542?¶

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-53542?¶

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.