CVE-2026-100369 — CliInvoke and its formerly named `AlastairLundy.CliInvoke` package are .NET libraries for…¶

Key facts

CVE-2026-100369 is a High (8.4) vulnerability: CliInvoke and its formerly named AlastairLundy.CliInvoke package are .NET libraries for…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-100369
Severity	High (8.4)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-100369/

Details¶

English | 한국어

Description¶

CliInvoke and its formerly named AlastairLundy.CliInvoke package are .NET libraries for invoking command-line programs and wrapping executable processes. CliInvoke versions 2.0.0 through 2.8.4, 2.9.0 through 2.9.3, 2.10.0 through 2.10.4, and 3.0.0-alpha.1 through 3.0.0-beta.1, as well as AlastairLundy.CliInvoke versions 2.0.0-alpha.1 through 2.0.0, contain an argument-injection vulnerability in RunnerProcessFactory on the 2.x line and RunnerConfigurationFactory on the 3.x line. These factories combine runner arguments, a caller-controlled target, and caller-controlled arguments into one ProcessStartInfo.Arguments string, allowing a double quote in the target or an argument to terminate an operating-system-level quoted region and inject unintended elements into the runner’s argument vector, potentially resulting in arbitrary command execution when a shell runner is used. The vulnerability is patched in CliInvoke versions 2.8.5, 2.9.4, 2.10.5, and 3.0.0-beta.2, and in AlastairLundy.CliInvoke version 2.0.2. No complete workaround is available; users unable to upgrade can partially mitigate the issue by removing double quotes from targets and arguments, additionally removing shell metacharacters when using shell runners, or bypassing the vulnerable factory and constructing a ProcessConfiguration with an explicit ArgumentList.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-100369
CVSS Score	8.4

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-100369/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-2026-100369

# 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/alastairlundy/CliInvoke/security/advisories/GHSA-j73w-8hfr-4gc9

Generated by PoC Generator on 2026-09-26T19:50:33.354128702

Frequently asked questions¶

What is CVE-2026-100369?¶