GHSA-GM8Q-M8MV-JJ5M

Vulnerability from github – Published: 2026-02-03 17:43 – Updated: 2026-02-04 19:53
VLAI?
Summary
Unstructured has Path Traversal via Malicious MSG Attachment that Allows Arbitrary File Write
Details

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

Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.18.17"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "unstructured"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.18.18"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-64712"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-73"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-03T17:43:56Z",
    "nvd_published_at": "2026-02-04T18:16:07Z",
    "severity": "CRITICAL"
  },
  "details": "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.\n\n  ## Impact\n  An attacker can craft a malicious .msg file with attachment filenames containing path traversal sequences (e.g.,\n  `../../../etc/cron.d/malicious`). When processed with `process_attachments=True`, the library writes the attachment to an\n  attacker-controlled path, potentially leading to:\n\n  - Arbitrary file overwrite\n  - Remote code execution (via overwriting configuration files, cron jobs, or Python packages)\n  - Data corruption\n  - Denial of service\n\n  ## Affected Functionality\n  The vulnerability affects the MSG file partitioning functionality when `process_attachments=True` is enabled.\n\n  ## Vulnerability Details\n  The library does not sanitize attachment filenames in MSG files before using them in file write operations, allowing directory\n  traversal sequences to escape the intended output directory.\n\n  ## Workarounds\n  Until patched, users can:\n  - Set `process_attachments=False` when processing untrusted MSG files\n  - Avoid processing MSG files from untrusted sources\n  - Implement additional filename validation before processing",
  "id": "GHSA-gm8q-m8mv-jj5m",
  "modified": "2026-02-04T19:53:04Z",
  "published": "2026-02-03T17:43:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Unstructured-IO/unstructured/security/advisories/GHSA-gm8q-m8mv-jj5m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-64712"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Unstructured-IO/unstructured/commit/b01d35b2373fd087d2e15162b9c021663c97155d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Unstructured-IO/unstructured"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Unstructured has Path Traversal via Malicious MSG Attachment that Allows Arbitrary File Write"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.