CVE-2026-29509: Improper Limitation of a Pathname to a Restricted Directory

Patool before 4.0.5 contains a path traversal vulnerability in the safeextract function in patoolib/programs/pytarfile.py when running on Python before 3.12, where the iswithindirectory helper uses os.path.commonprefix for character-level string comparison instead of path-level comparison, allowi...