CVE-2026-55786 — Flyto2 Core is an execution kernel for automation and AI-agent workflows.¶
Key facts
CVE-2026-55786 is a High (8.4) vulnerability: Flyto2 Core is an execution kernel for automation and AI-agent workflows.. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-55786 |
| Severity | High (8.4) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-55786/ |
Details¶
English | 한국어
Description¶
Flyto2 Core is an execution kernel for automation and AI-agent workflows. From 2.26.2 until 2.26.4, the HTTP MCP POST /mcp route accepts unauthenticated JSON-RPC tools/call requests and forwards execute_module arguments to the module registry without the require_auth dependency used by the REST execution routes. An unauthenticated caller can select sandbox.execute_shell and supply its command parameter, which reaches asyncio.create_subprocess_shell with the privileges of the flyto-core server process. The endpoint is reachable locally under the default loopback binding and becomes network reachable when an operator binds the server to a non-loopback interface, allowing arbitrary OS command execution and potential full host compromise. This issue is fixed in version 2.26.4.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-55786 |
| Type | RCE |
| CVSS Score | 8.4 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-55786/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-2026-55786
# 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/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225e
- https://github.com/flytohub/flyto-core/releases/tag/v2.26.4
- https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85
Generated by PoC Generator on 2026-10-15T07:41:51.504471972
Frequently asked questions¶
What is CVE-2026-55786?¶
CVE-2026-55786 is a High (8.4) vulnerability: Flyto2 Core is an execution kernel for automation and AI-agent workflows.. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-55786?¶
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-2026-55786?¶
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.