CVE-2026-102937

Name	CVE-2026-102937
Description	virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.12, BatchActivator.quote() returns prompt text unchanged before activate.bat inserts it into a cmd.exe set "VAR=value" statement. An attacker who influences --prompt, VIRTUALENV_PROMPT, or the corresponding configuration value can include a double quote that closes the assignment and leaves following cmd.exe operators as executable syntax. When a user activates the generated Windows environment, the injected commands run with that user's privileges. This issue is fixed in version 21.7.12.
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)

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	fixed
	trixie	20.31.2+ds-1+deb13u1	fixed
	forky, sid	21.5.1+ds-1	fixed

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)	(not affected)

Notes

- python-virtualenv <not-affected> (Windows-specific)
https://github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q
https://github.com/pypa/virtualenv/pull/3250
Fixed by: https://github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6 (21.7.12)