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Message-ID: <f0ba171d-063b-4091-98cc-6c68ab124a74@oracle.com>
Date: Mon, 27 Apr 2026 18:45:50 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: [CVE-2026-3087] shutil.unpack_archive() doesn't check
for Windows absolute paths in ZIPs
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-3087] shutil.unpack_archive() doesn't
check for Windows absolute paths in ZIPs
Date: Mon, 27 Apr 2026 20:48:33 +0000
From: Seth Larson <seth@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
There is a MEDIUM severity vulnerability affecting CPython.
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.
Please see the linked CVE ID for the latest information on affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-3087
* https://github.com/python/cpython/pull/146591
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