[oss-security][CVE-2026-5271] Python install manager script aliases search path hijack

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

-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-5271] Python install manager script 
aliases search path hijack
Date: Wed, 1 Apr 2026 18:07:40 +0100
From: Steve Dower <steve.dower () python org>
Reply-To: security-sig () python org
To: security-announce () python org

There is a MEDIUM severity vulnerability affecting the Python install manager.

Script alias entrypoints (e.g. pip.exe) generated by version 26.0 of the Python 
install manager were very likely to have an empty search path, leading to 
modules in the current working directory being able to override the intended 
module and execute code as the user.

Version 26.1 is fixed. Versions prior to 26.0 are not impacted.

After installing the updated version, run "py install --refresh" to regenerate 
existing aliases.

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

* https://www.cve.org/CVERecord?id=CVE-2026-5271
* https://github.com/python/pymanager/pull/301
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