CVE-2026-71428
Received Received - Intake

Untrusted URL Host in Unstructured Library

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: GitHub, Inc.

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.

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Meta Information

Published
2026-08-20
Last Modified
2026-08-20
Generated
2026-08-20
AI Q&A
2026-08-20
EPSS Evaluated
N/A
NVD
CVE-2026-71428
EUVD
EUVD-2026-63472

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
unstructured-io unstructured From 0.4.7 (inc) to 0.24.0 (exc)
unstructured-io unstructured 0.24.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-601 The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

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Executive Summary

This vulnerability affects the unstructured library, which processes images and documents like PDFs or Word files. Between versions 0.4.7 and 0.24.0, the library fetches URLs without validating the host, allowing attackers to manipulate requests to internal services or cloud endpoints. This can lead to disclosure of internal responses or unintended actions on side-effecting endpoints.

Detection Guidance

Detecting this vulnerability requires checking if your system uses unstructured library versions between 0.4.7 and 0.24.0. Run commands like pip show unstructured or pip list to check the installed version. Inspect network logs for unusual requests to loopback addresses or internal services from the unstructured library.

Impact Analysis

If you use the affected unstructured library versions, an attacker could exploit this to access internal network resources, steal sensitive data from internal services, or trigger unintended actions on vulnerable endpoints. This could compromise data confidentiality and system integrity.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles or HIPAA's security requirements for protected health information. Organizations using the affected library may face compliance breaches, legal penalties, and reputational damage.

Mitigation Strategies

Immediately upgrade the unstructured library to version 0.24.0 or later. If upgrading is not possible, restrict network access to the unstructured library or disable its network-facing features until patched. Monitor for unusual network activity targeting internal services.

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