{"id":"CVE-2026-113726","aliases":[],"title":"virtualenv activate runs commands from the environment name in zsh with PROMPT_SUBST","titleSource":"GitHub_M","descriptionSource":"GitHub_M","products":[{"vendor":"pypa","name":"virtualenv","platforms":[],"versions":[{"version":"< 21.14.4","status":"affected"}],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-113726"}],"remediation":[],"description":"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21.14.4.","severity":"high","score":7.8,"published":"2026-10-20T22:05:24.253Z","modified":"2026-10-27T21:31:29.377Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/pypa/virtualenv/security/advisories/GHSA-5vjq-rrrf-7h2q","https://github.com/pypa/virtualenv/commit/5b915367da82bd024b2a0d28d2f98007034b4aa2","https://github.com/pypa/virtualenv/releases/tag/21.14.4"],"sources":[{"name":"CVE","id":"CVE-2026-113726","modified":"2026-10-27T21:31:29.377Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-113726"}],"assessments":[{"source":"GitHub_M","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T21:00:33.596Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}