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CVE-2026-3087— shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs

Quick assessment

Affected
Python Software Foundation CPython
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.

CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在路径遍历漏洞，该漏洞源于处理包含绝对Windows路径的ZIP归档时，可能导致归档提取到目标目录之外。

CVSS 6.0 · Medium EPSS 0.73% · P53

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.10.21 affected
3.11.0< 3.11.16 affected
3.12.0< 3.12.14 affected
3.13.0< 3.13.14 affected
3.14.0a1< 3.14.5rc1 affected
3.15.0a1< 3.15.0b1 affected
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I. Basic Information for CVE-2026-3087

Vulnerability Information
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Vulnerability Title
shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
Source: CVE Program / CVE List V5
Vulnerability Description
If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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
CPython 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在路径遍历漏洞，该漏洞源于处理包含绝对Windows路径的ZIP归档时，可能导致归档提取到目标目录之外。
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
Python Software Foundation CPython 0 ~ 3.10.21 -

II. Public POCs for CVE-2026-3087

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III. Intelligence Information for CVE-2026-3087

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Patches & Fixes for CVE-2026-3087 (11)

Mailing List Discussions for CVE-2026-3087 (1)

Other References for CVE-2026-3087 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation
Same weakness: CWE-22

V. Comments for CVE-2026-3087

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