Bug 2493710 (CVE-2026-29509)

Summary: CVE-2026-29509 patool: Patool: Arbitrary file write via path traversal in archive extraction
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Patool. A remote attacker could exploit a path traversal vulnerability in the `safe_extract()` function by providing a specially crafted archive. This vulnerability arises because a helper function uses an insecure comparison method, allowing malicious paths to bypass security checks. Successful exploitation could enable the attacker to write arbitrary files to unintended locations on the system, potentially leading to information disclosure or system compromise.
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Description OSIDB Bzimport 2026-06-26 21:02:13 UTC 
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.