pypa virtualenv up to 21.14.1 Fish Activator activate.fish ViaTemplateActivator.quote prompt/VIRTUALENV_PROMPT os command injection

Summaryinfo

A vulnerability classified as problematic was found in pypa virtualenv up to 21.14.1. This impacts the function ViaTemplateActivator.quote of the file activate.fish of the component Fish Activator. The manipulation of the argument prompt/VIRTUALENV_PROMPT results in os command injection. This vulnerability is cataloged as CVE-2026-113732. The attack must be initiated from a local position. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in pypa virtualenv up to 21.14.1. Affected is the function ViaTemplateActivator.quote of the file activate.fish of the component Fish Activator. The manipulation of the argument prompt/VIRTUALENV_PROMPT with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.2, FishActivator inherits ViaTemplateActivator.quote(), which uses POSIX shlex.quote() even though fish interprets backslashes and single quotes differently. An attacker-influenced environment path, --prompt, or VIRTUALENV_PROMPT value containing a backslash before a quote can therefore terminate the generated fish literal and execute command substitution when the user sources activate.fish. This issue is fixed in version 21.14.2.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-113732 since 10/20/2026. The exploitability is told to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 21.14.2 eliminates this vulnerability.

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Productinfo

Vendor

• pypa

Name

• virtualenv

Version

• 21.14.0
• 21.14.1

Website

• Product: https://github.com/pypa/virtualenv/

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