CVE-2026-102937: Pypa Virtualenv

High severity, CVSS 7.3. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Pypa Virtualenv: before 21.7.12 (fixed in 21.7.12)

Published 2026-09-29. Last modified 2026-10-02.