Vulnerability Report

CVE-2026-3087

Title: Python shutil.unpack_archive Path Traversal on Windows

Arbitrary File Access

Proof Of Concept

No public PoC currently indexed for CVE-2026-3087.

CWE Category CWE-22

Published Date Apr 27, 2026

Modified Date Jun 05, 2026

Exploit Status Not Found

Score 6.0 CVSS v4.0

Exploit Probability (EPSS)

0.53%

Vulnerability Summary

CVE-2026-3087: 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.

Impacted Vendors

python_software_foundation 1

python 1

Reference Links

https://github.com/python/cpython/issues/146581 https://github.com/python/cpython/pull/146591 https://mail.python.org/archives/list/[email protected]/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/

CVSS v4.0

Source Entity [email protected]

Severity MEDIUM

6.0

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5