pip prior to version 26.1 would run self-update check functionality after installing wheel files which required importing well-known Python modules names. These module imports were intentionally deferred to increase startup time of the pip CLI. The patch changes self-update functionality to run before wheels are installed to prevent newly-installed modules from being imported shortly after the installation of a wheel package. Users should still review package contents prior to installation.

pip doesn't reject concatenated ZIP and tar archives

Limited path traversal when installing wheel archives

-------- Forwarded Message -------- 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. 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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-------- Forwarded Message -------- Date: Mon, 27 Apr 2026 14:20:59 +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 the pip project. Please see the linked CVE ID for the latest information on affected versions:

https://www.cve.org/CVERecord?id=CVE-2026-6357 https://github.com/pypa/pip/pull/13923

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https://www.cve.org/CVERecord?id=CVE-2026-8643 currently lists the affected versions as "affected from 0 before 26.1.2".

-------- Forwarded Message -------- Date: Mon, 1 Jun 2026 15:03:45 +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. Please see the linked CVE ID for the latest information on affected versions:

https://www.cve.org/CVERecord?id=CVE-2026-8643 https://github.com/pypa/pip/pull/14000

Security-announce mailing list -- security-announce () python org https://mail.python.org/mailman3//lists/security-announce.python.org