Fwd: [CVE-2026-3219] pip doesn't reject concatenated ZIP and tar archives

[Alan Coopersmith <alan.coopersmith () oracle com>]

-------- Forwarded Message --------
Subject: 	[Security-announce][CVE-2026-3219] pip doesn't reject concatenated ZIP 
and tar archives
Date:   Mon, 20 Apr 2026 15:02:13 +0000
From:   Seth Larson <seth () python org>
Reply-To:       security-sig () python org
To:     security-announce () python org



There is a MEDIUM severity vulnerability affecting pip.

pip handles concatenated tar and ZIP files as ZIP files regardless of filename 
or whether a file is both a tar and ZIP file. This behavior could result in 
confusing installation behavior, such as installing "incorrect" files according 
to the filename of the archive. New behavior only proceeds with installation if 
the file identifies uniquely as a ZIP or tar archive, not as both.

Please see the linked CVE ID for the latest information on affected versions:

* https://www.cve.org/CVERecord?id=CVE-2026-3219
* https://github.com/pypa/pip/pull/13870

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