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[ CVE-2026-113722 · Published 20 Oct 2026 ]

virtualenv: Generated POSIX console launchers interpret destination paths as shell syntax

CVSS 7.8 EPSS <1%Fix available

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

  • virtualenv 21.14.9Fixed version · GitHub Advisories · pip package virtualenv: upgrade to 21.14.9 or later (affected < 21.14.9)

[ Packages ]Affected open-source packages

[ References ]References