CVE-2026-113715

Name	CVE-2026-113715
Description	virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the stdlib venv creator reads generated pyvenv.cfg with str.splitlines() and merges parsed keys over virtualenv's selected configuration. An untrusted caller who influences the destination pathname can include a line-boundary character such as U+2028 to inject keys including home and include-system-site-packages, causing path data to change configuration structure before final output. Setting include-system-site-packages to true weakens environment isolation, while an altered home can change which standard-library files the interpreter loads if the attacker also controls that location. The builtin creator does not use this readback path. This issue is fixed in version 21.14.9.
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	1151685

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-virtualenv (PTS)	bookworm	20.17.1+ds-1	vulnerable
	trixie	20.31.2+ds-1+deb13u1	vulnerable
	forky, sid	21.5.1+ds-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-virtualenv	source	(unstable)	(unfixed)			1151685

Notes

https://github.com/pypa/virtualenv/security/advisories/GHSA-qmx5-4p3x-wvqf
https://github.com/pypa/virtualenv/pull/3426
Fixed by: https://github.com/pypa/virtualenv/commit/b0008a58885ded9227faf8f910c6c402712c750a (21.14.9)