CVE-2026-29509 · Symaro Security Advisory

Description

Patool before 4.0.5 contains a path traversal vulnerability in the safe_extract() function in patoolib/programs/py_tarfile.py when running on Python before 3.12, where the is_within_directory() helper uses os.path.commonprefix() for character-level string comparison instead of path-level comparison, allowing a crafted archive member path to bypass the containment check. Attackers can supply a malicious archive with specially crafted member paths to write arbitrary files.

Severity (CVSS)

Base score	5.3
Severity	Medium
Version	CVSS 4.0
Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Provided by	CNA

Weaknesses

CWE-22 — Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected products

Vendor	Product	Versions
wummel	patool	0 to <4.0.5

References

https://github.com/wummel/patool/releases/tag/4.0.5 (patch)
https://github.com/wummel/patool/blob/main/doc/changelog.txt (release-notes)
https://www.vulncheck.com/advisories/patool-path-traversal-via-safe-extract-function (third-party-advisory)

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 27 Jun 2026 07:02 UTC.