CVE-2026-29509

Patool < 4.0.5 Path Traversal via safe_extract() Function

CVSS 5.3 MEDIUMEPSS 0.3%CWE-22

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.3EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

26 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Affected products

wummel · patool

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References

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