CVE-2026-102937

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.

• CWE-78

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

Published

Sep 29, 2026

Last Modified

Sep 29, 2026

Status

Received

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