Command Injection Affecting virtualenv package, versions [,21.7.12)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-VIRTUALENV-20335500
- published30 Sept 2026
- disclosed29 Sept 2026
- creditBernát Gábor
Introduced: 29 Sep 2026
NewCVE-2026-102937 (opens in a new tab)How to fix?
Upgrade virtualenv to version 21.7.12 or higher.
Overview
Affected versions of this package are vulnerable to Command Injection via the BatchActivator.quote method in src/virtualenv/activation/batch/__init__.py, which previously returned its input string unchanged. When a virtualenv is created in a path containing cmd.exe operator characters such as &, |, <, >, ^, !, or ", those characters are embedded verbatim into the generated activate.bat script inside @set "VAR=value" statements. An attacker who controls the virtualenv path or environment values can inject arbitrary cmd.exe commands that execute when a user sources the activation script.