pypa virtualenv up to 21.14.8 ScriptMakerCustom/pip os command injection

Summaryinfo

A vulnerability labeled as problematic has been found in pypa virtualenv up to 21.14.8. The affected element is an unknown function of the component ScriptMakerCustom/pip. Such manipulation leads to os command injection. This vulnerability is listed as CVE-2026-113722. The attack must be carried out locally. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in pypa virtualenv up to 21.14.8 and classified as problematic. Affected by this issue is an unknown part of the component ScriptMakerCustom/pip. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, virtualenv's ScriptMakerCustom and pip pass an incompletely quoted interpreter path to distlib ScriptMaker when generating POSIX console scripts. When the path contains a space or produces a shebang longer than 127 bytes, distlib emits a /bin/sh wrapper whose double-quoted interpreter path still expands command substitutions and backticks. An attacker who influences the environment destination can therefore execute commands with the user's privileges when the user later runs a generated launcher; environment creation and activation do not trigger the command. Existing launchers are not repaired by upgrading virtualenv alone and must be regenerated, while a later independent pip installation or upgrade can reintroduce an affected launcher because pip's vendored distlib is unchanged. The virtualenv fix is released in version 21.14.9.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-113722 since 10/20/2026. The exploitation is known to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 21.14.9 eliminates this vulnerability.

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Productinfo

Vendor

• pypa

Name

• virtualenv

Version

• 21.14.0
• 21.14.1
• 21.14.2
• 21.14.3
• 21.14.4
• 21.14.5
• 21.14.6
• 21.14.7
• 21.14.8

Website

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

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