Unstructured-IO vulnerabilities and threats

CVE-2026-104250 is a stored cross-site scripting (XSS) vulnerability in the unstructured library prior to version 0.24.1. When unstructured parses untrusted HTML documents and outputs them as HTML, it fails to escape malicious markup such as event handlers (e.g., onerror, onmouseover) and javascript: URLs. This allows embedded scripts to execute automatically in a viewer's browser when the output is rendered. The vulnerability affects the to_html() function and related HTML output paths. Exploitation can occur without user interaction, leading to information disclosure and potential privileged actions in ingestion pipelines where untrusted documents are reviewed in a web UI.

CVE-2026-71428 is an open redirect vulnerability in the unstructured library versions from 0.4.7 up to but not including 0.24.0. The library's functions partition, partition_html, and partition_md fetch URLs without validating the host, allowing attackers controlling the URL to induce server-side requests to internal or cloud metadata endpoints. This can lead to disclosure of internal responses and potentially trigger side-effecting GET endpoints. The vulnerability is fixed in version 0.24.0.

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. Prior to version 0.18.18, a path traversal vulnerability in the partition_msg function allows an attacker to write or overwrite arbitrary files on the filesystem when processing malicious MSG files with attachments. This issue has been patched in version 0.18.18.