CVE-2026-29509

mediumCVSS 5.4covered by 1 sourcefirst seen 2026-06-26

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.

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Exploitation outlook

Low exploitation risk0.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-29509: Patool before 4.0.5 contains a path traversal vulnerability in the safe_extract() function in …nvd · 2026-06-26

External references

NVD record for CVE-2026-29509

CVE.org record

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