PT-2026-6424 · Pypi · Unstructured

Published 2026-02-03 · Updated 2026-02-03

OSV

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Impact

An attacker can craft a malicious .msg file with attachment filenames containing path traversal sequences (e.g., ../../../etc/cron.d/malicious). When processed with process attachments=True, the library writes the attachment to an attacker-controlled path, potentially leading to:

• Arbitrary file overwrite
• Remote code execution (via overwriting configuration files, cron jobs, or Python packages)
• Data corruption
• Denial of service

Affected Functionality

The vulnerability affects the MSG file partitioning functionality when process attachments=True is enabled.

Vulnerability Details

The library does not sanitize attachment filenames in MSG files before using them in file write operations, allowing directory traversal sequences to escape the intended output directory.

Workarounds

Until patched, users can:

• Set process attachments=False when processing untrusted MSG files
• Avoid processing MSG files from untrusted sources
• Implement additional filename validation before processing

Fix

Path traversal

Weakness Enumeration

CWE-73

CWE-22

Related Identifiers

GHSA-GM8Q-M8MV-JJ5M

Affected Products

Unstructured

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2025-64712 · Security Note
• https://osv.dev/vulnerability/GHSA-gm8q-m8mv-jj5m · Vendor Advisory
• https://github.com/Unstructured-IO/unstructured/commit/b01d35b2373fd087d2e15162b9c021663c97155d · Note
• https://github.com/Unstructured-IO/unstructured/security/advisories/GHSA-gm8q-m8mv-jj5m · Note
• https://github.com/Unstructured-IO/unstructured · Note