CVE-2026-113726

The record

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.13.0, the bash activate script that zsh also sources leaves the environment name unescaped; from 21.13.0 until 21.14.4, it escapes backslashes, dollar signs, and backticks only when BASH_VERSION is set, so zsh receives the raw value. The script assigns that value to PS1. In zsh with PROMPT_SUBST, an attacker-influenced environment directory, --prompt, or VIRTUALENV_PROMPT value containing command, parameter, or arithmetic expansion syntax can therefore execute commands in the user's shell each time the prompt is drawn. A percent sign is separately interpreted as a zsh prompt escape but does not by itself execute commands. Plain zsh with PROMPT_SUBST disabled and bash are not affected by this mechanism. This issue is fixed in version 21.14.4.

Affected packages

Related vulnerabilities

• CVE-2026-96376 Improper Neutralization of Special Elements used in an OS Command ("OS Command… CWE-78
• CVE-2026-113732 virtualenv is a tool for creating isolated virtual python environments. CWE-78
• CVE-2026-113776 virtualenv is a tool for creating isolated virtual python environments. CWE-78
• CVE-2026-113725 virtualenv is a tool for creating isolated virtual python environments. CWE-78
• CVE-2026-113722 virtualenv is a tool for creating isolated virtual python environments. CWE-78
• CVE-2026-112943 launch-editor allows users to open files with line numbers in editor from Node.js. CWE-78
• CVE-2026-112900 Pillow is a Python imaging library. CWE-78
• CVE-2026-112263 Television (tv) 0.15.0 through 0.15.9 contains an OS command injection vulnerability that… CWE-78