Unstructured-IO Unstructured up to 0.23.x URL Validation auto.py partition/partition_html/partition_md url dns rebinding

Summaryinfo

A vulnerability was found in Unstructured-IO Unstructured up to 0.23.x and classified as critical. This issue affects the function partition/partition_html/partition_md of the file unstructured/partition/auto.py of the component URL Validation. Such manipulation of the argument url leads to dns rebinding. This vulnerability is uniquely identified as CVE-2026-71428. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Unstructured-IO Unstructured up to 0.23.x and classified as critical. Affected by this issue is the function partition/partition_html/partition_md of the file unstructured/partition/auto.py of the component URL Validation. The manipulation of the argument url with an unknown input leads to a dns rebinding vulnerability. Using CWE to declare the problem leads to CWE-350. The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-71428 since 08/06/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1583.002 by the MITRE ATT&CK project.

Upgrading to version 0.24.0 eliminates this vulnerability.

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Productinfo

Vendor

• Unstructured-IO

Name

• Unstructured

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23

Website

• Product: https://github.com/Unstructured-IO/unstructured/

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