Command Injection Affecting virtualenv package, versions [20.26.6,21.14.2)
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-21282339
- published21 Oct 2026
- disclosed21 Oct 2026
- creditKevin Stubbings
Introduced: 21 Oct 2026
NewCVE-2026-113776 (opens in a new tab)How to fix?
Upgrade virtualenv to version 21.14.2 or higher.
Overview
Affected versions of this package are vulnerable to Command Injection via instantiate_template in src/virtualenv/activation/via_template.py, which replaces placeholders one at a time across the entire activation script template. When a path component (such as a parent directory) is named __VIRTUAL_NAME__, the already-quoted value containing that placeholder name is rewritten by a subsequent substitution pass, causing the second value's quotes to close the first and allowing the remainder of the path to run as arbitrary code in bash, fish, xonsh, and activate_this.py. In csh, the same sequential substitution breaks prompt display tokens in activate.csh the same way.