Medium 5.4Published Jun 26, 2026

CVE-2026-29509Patool < 4.0.5 Path Traversal via safe_extract() Function

Updated under an hour ago (Oct 27, 2026, 7:40 AM ET)

Does this affect you?

It affects wummel patool. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for wummel patool

Exploited in the last 30 days

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.

CVSS: 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

wummel patool wummel:patool (from the name)	before 4.0.5	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.