Command Injection Affecting virtualenv package, versions [,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-21282342
- published21 Oct 2026
- disclosed21 Oct 2026
- creditKevin Stubbings
Introduced: 21 Oct 2026
NewCVE-2026-113732 (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 FishActivator, which inherits shlex.quote for escaping shell arguments. The POSIX quoting rules applied by shlex.quote leave backslash characters literal inside single quotes, but the fish shell treats \' as an escaped quote, not a literal backslash followed by a quote. An attacker who controls a virtualenv path or --prompt value containing a backslash immediately before a single quote can cause the single-quoted literal to terminate early, allowing the remainder of the string to be interpreted and executed as arbitrary fish shell commands when the activation script is sourced.