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CVE-2026-29509— Patool < 4.0.5 Path Traversal via safe_extract() Function

Quick assessment

Affected
wummel patool
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wummel patool是wummel组织的一款命令行归档工具。 wummel patool 4.0.5之前版本存在路径遍历漏洞，该漏洞源于safe_extract()函数中的路径遍历问题，允许攻击者通过特制的归档成员路径绕过包含检查，并写入任意文件。

CVSS 5.4 · Medium EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
wummel patool < 4.0.5 affected
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I. Basic Information for CVE-2026-29509

Vulnerability Information
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Vulnerability Title
Patool < 4.0.5 Path Traversal via safe_extract() Function
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
wummel patool 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wummel patool是wummel组织的一款命令行归档工具。 wummel patool 4.0.5之前版本存在路径遍历漏洞，该漏洞源于safe_extract()函数中的路径遍历问题，允许攻击者通过特制的归档成员路径绕过包含检查，并写入任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wummel patool 0 ~ 4.0.5 -

II. Public POCs for CVE-2026-29509

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III. Intelligence Information for CVE-2026-29509

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Patches & Fixes for CVE-2026-29509 (1)

Vendor Advisories for CVE-2026-29509 (1)

IV. Related Vulnerabilities

Same product: patool
Same vendor: wummel
Same weakness: CWE-22

V. Comments for CVE-2026-29509

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