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CVE-2026-35592— pyLoad has an Incomplete Tar Path Traversal Fix in UnTar._safe_extractall via os.path.commonprefix Bypass

Quick assessment

Affected
pyload pyload
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.

pyLoad是pyLoad开源的一个用 Python 编写的免费开源下载管理器。 pyLoad 0.5.0b3.dev97之前版本存在路径遍历漏洞，该漏洞源于_safe_extractall函数使用os.path.commonprefix进行路径遍历检查，该函数执行字符级字符串比较而非路径级比较，可能导致特制tar存档将文件写入预期提取目录之外。

CVSS 5.3 · Medium EPSS 0.35% · P27
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I. Basic Information for CVE-2026-35592

Vulnerability Information
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Vulnerability Title
pyLoad has an Incomplete Tar Path Traversal Fix in UnTar._safe_extractall via os.path.commonprefix Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev97, the _safe_extractall() function in src/pyload/plugins/extractors/UnTar.py uses os.path.commonprefix() for its path traversal check, which performs character-level string comparison rather than path-level comparison. This allows a specially crafted tar archive to write files outside the intended extraction directory. The correct function os.path.commonpath() was added to the codebase in the CVE-2026-32808 fix (commit 5f4f0fa) but was never applied to _safe_extractall(), making this an incomplete fix. This vulnerability is fixed in 0.5.0b3.dev97.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/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
pyLoad 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pyLoad是pyLoad开源的一个用 Python 编写的免费开源下载管理器。 pyLoad 0.5.0b3.dev97之前版本存在路径遍历漏洞，该漏洞源于_safe_extractall函数使用os.path.commonprefix进行路径遍历检查，该函数执行字符级字符串比较而非路径级比较，可能导致特制tar存档将文件写入预期提取目录之外。
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
pyload pyload < 0.5.0b3.dev97 -

II. Public POCs for CVE-2026-35592

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III. Intelligence Information for CVE-2026-35592

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Vendor Advisories for CVE-2026-35592 (1)

Same Patch Batch · pyload · 2026-04-07 · 4 CVEs total

CVE-2026-35463 8.8 HIGH pyLoad has Improper Neutralization of Special Elements used in an OS Command
CVE-2026-35464 7.5 HIGH pyLoad has an incomplete fix for CVE-2026-33509: unprotected storage_folder enables arbitr
CVE-2026-35586 6.8 MEDIUM Authorization Bypass for SSL Certificate/Key Configuration Due to Option Name Mismatch in

IV. Related Vulnerabilities

Same product: pyload
Same vendor: pyload
Same weakness: CWE-22

V. Comments for CVE-2026-35592

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