---
id: CVE-2026-106057
title: >-
  patool before 4.0.6 contains an OS command injection vulnerability on Windows
  because shell_quote_nt fails to escape cmd.exe metacharacters or embedded
  double quotes in archive filenames
summary: >-
  patool before 4.0.6 contains an OS command injection vulnerability on Windows
  because shell_quote_nt fails to escape cmd.exe metacharacters or embedded
  double quotes in archive filenames. Attackers can supply crafted filenames
  like repor…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
vendor: wummel
product: patool
affected:
  - patool < 4.0.6
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T12:17:08.730'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106057'
references:
  - url: 'https://github.com/wummel/patool'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/wummel/patool/blob/4.0.5/patoolib/util.py#L110-L116'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/wummel/patool/commit/592f35761f428afbcde2888ecd3cc4af43881aeb
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/patool-before-4.0.6-os-command-injection-on-windows-via-shell-quote-nt
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-07T12:29:01.367Z'
---

## Overview

patool before 4.0.6 contains an OS command injection vulnerability on Windows because shell_quote_nt fails to escape cmd.exe metacharacters or embedded double quotes in archive filenames. Attackers can supply crafted filenames like report&calc.gz for single-file formats run with shell=True to execute commands with patool process privileges.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.