{"id":"CVE-2026-29509","title":"Patool < 4.0.5 Path Traversal via safe_extract() Function","summary":"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 char…","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-22"],"vendor":"wummel","product":"patool","affected":["patool < 4.0.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-27T03:03:15.517374Z"},"published":"2026-06-26","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:01:53.523Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-29509","references":[{"url":"https://github.com/wummel/patool/releases/tag/4.0.5","label":"patool 4.0.5 Release Notes"},{"url":"https://github.com/wummel/patool/blob/main/doc/changelog.txt"},{"url":"https://www.vulncheck.com/advisories/patool-path-traversal-via-safe-extract-function"}],"tags":["cve.org"],"epss":0.00371,"epssPercentile":0.31296,"ingestedAt":"2026-11-08T14:51:22.460Z","slug":"CVE-2026-29509","body":"## Overview\n\nPatool 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.\n\n## Affected\n\n- `patool < 4.0.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}