CVE-2026-71428 — The unstructured library provides open-source components for ingesting and pre-processing…¶
Key facts
CVE-2026-71428 is a Critical (9.3) vulnerability: The unstructured library provides open-source components for ingesting and pre-processing…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-71428 |
| Severity | Critical (9.3) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-71428/ |
Details¶
English | 한국어
Description¶
The unstructured library provides open-source components for ingesting and pre-processing images and text documents, such as PDFs, HTML, Word docs, and many more. From 0.4.7 until 0.24.0, the url argument of partition, partition_html, and partition_md is fetched without host validation in unstructured/partition/auto.py, unstructured/partition/html/partition.py, and unstructured/partition/md.py. An attacker who controls that URL can make a server-side ingestion service request loopback addresses, internal HTTP services, or cloud metadata endpoints through direct targets, redirects, or DNS rebinding. The response body is returned as Element text, allowing internal response disclosure, and side-effecting GET endpoints may also be triggered. This issue is fixed in version 0.24.0.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-71428 |
| Type | RCE |
| CVSS Score | 9.3 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-71428/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-2026-71428
# 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/Unstructured-IO/unstructured/commit/445c95735c4045057f51f399bc04c657751923bd
- https://github.com/Unstructured-IO/unstructured/pull/4388
- https://github.com/Unstructured-IO/unstructured/releases/tag/0.24.0
- https://github.com/Unstructured-IO/unstructured/security/advisories/GHSA-4mvj-m6j5-pmf7
Generated by PoC Generator on 2026-08-23T01:44:40.562807937
Frequently asked questions¶
What is CVE-2026-71428?¶
CVE-2026-71428 is a Critical (9.3) vulnerability: The unstructured library provides open-source components for ingesting and pre-processing…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-71428?¶
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-2026-71428?¶
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.