CVE-2026-106057: patool before 4.0.6 OS Command Injection on Windows via shell_quote_nt

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-07 · updated 2026-10-07
Weakness: CWE-78

Description

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.

Affected products

wummel patool: before 4.0.6 — fixed in 4.0.6

How to fix

Upgrade to a fixed version: wummel patool 4.0.6. Check the vendor advisory for mitigations.

References

https://github.com/wummel/patool
https://github.com/wummel/patool/blob/4.0.5/patoolib/util.py#L110-L116
https://github.com/wummel/patool/commit/592f35761f428afbcde2888ecd3cc4af43881aeb
https://www.vulncheck.com/advisories/patool-before-4.0.6-os-command-injection-on-windows-via-shell-quote-nt

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