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CVE-2026-102937 virtualenv is a tool for creating isolated virtual python environments

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.

Affected products and versions

Product Affected versions Fixed in
virtualenv 21.7 earliest → < 21.7.12 21.7.12

References

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