CVE-2026-29509

MEDIUM 5.4

Patool < 4.0.5 Path Traversal via safe_extract() Function

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	wummel
Product	patool
Published	Jun 26, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

wummel / patool

0 < 4.0.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/wummel/patool/releases/tag/4.0.5 github.com: https://github.com/wummel/patool/blob/main/doc/changelog.txt vulncheck.com: https://www.vulncheck.com/advisories/patool-path-traversal-via-safe-extract-function

Credits

CodeAnt AI Security VulnCheck