CVE-2026-6357

Name	CVE-2026-6357
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1135110

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-pip (PTS)	bullseye	20.3.4-4+deb11u1	vulnerable
	bullseye (security)	20.3.4-4+deb11u2	vulnerable
	bookworm	23.0.1+dfsg-1	vulnerable
	trixie	25.1.1+dfsg-1	vulnerable
	forky, sid	26.0.1+dfsg-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-pip	source	(unstable)	(unfixed)			1135110

https://github.com/pypa/pip/pull/13923