virtualenv: Command injection via --prompt in activate.bat (batch activator)

[ Description ]Official 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.

[ Fixes ]Fixes and patches

• virtualenv 21.7.12Fixed version · GitHub Advisories · pip package virtualenv: upgrade to 21.7.12 or later (affected <= 21.7.11)

[ Advisories ]Government CERT advisories

• BSI CERT-Bund21 Oct 2026WID-SEC-2026-4111

  Red Hat Ansible Automation Platform: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-11332CVE-2026-102938CVE-2026-103262+21 more CVEs

[ Packages ]Affected open-source packages

• virtualenv pipAffected <= 21.7.11 · fixed in 21.7.12 · GHSA-x78j-v8h9-3j2q

[ References ]References

• github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6
• github.com/pypa/virtualenv/pull/3250
• github.com/pypa/virtualenv/releases/tag/21.7.12
• github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q