CVE-2026-49950 — Xorbits Xoscar through 0.11.2 contains an unauthenticated deserialization vulnerability…¶
Key facts
CVE-2026-49950 is a Critical (9.8) vulnerability: Xorbits Xoscar through 0.11.2 contains an unauthenticated deserialization vulnerability…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-49950 |
| Severity | Critical (9.8) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-49950/ |
Details¶
English | 한국어
Description¶
Xorbits Xoscar through 0.11.2 contains an unauthenticated deserialization vulnerability that allows remote attackers to execute arbitrary code by sending crafted data over the actor-pool TCP channel. Attackers can exploit SocketChannel.recv() passing unvalidated data to cloudpickle.loads(), which triggers pickle reduce gadget execution before message type validation, achieving remote code execution as the server process which commonly runs as root on GPU nodes.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-49950 |
| Type | RCE |
| CVSS Score | 9.8 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-49950/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-2026-49950
# 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/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/backends/communication/socket.py#L99-L104
- https://github.com/xorbitsai/xoscar/blob/v0.11.2/python/xoscar/serialization/core.pyx#L260
- https://www.vulncheck.com/advisories/xorbits-xoscar-unauthenticated-deserialization-rce-via-actor-pool
Generated by PoC Generator on 2026-10-14T22:49:00.632606646
Frequently asked questions¶
What is CVE-2026-49950?¶
CVE-2026-49950 is a Critical (9.8) vulnerability: Xorbits Xoscar through 0.11.2 contains an unauthenticated deserialization vulnerability…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-49950?¶
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-2026-49950?¶
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.