Vulnerability from bitnami_vulndb
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": [
{
"package": {
"ecosystem": "Bitnami",
"name": "virtualenv",
"purl": "pkg:bitnami/virtualenv"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "21.14.4"
}
],
"type": "SEMVER"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
],
"aliases": [
"CVE-2026-113726"
],
"database_specific": {
"cpes": [
"cpe:2.3:a:virtualenv:virtualenv:*:*:*:*:*:python:*:*"
],
"severity": "High"
},
"details": "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\u0027s 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.",
"id": "BIT-virtualenv-2026-113726",
"modified": "2026-10-29T09:16:42.832Z",
"published": "2026-10-29T09:00:43.777Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pypa/virtualenv/commit/5b915367da82bd024b2a0d28d2f98007034b4aa2"
},
{
"type": "WEB",
"url": "https://github.com/pypa/virtualenv/releases/tag/21.14.4"
},
{
"type": "WEB",
"url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-5vjq-rrrf-7h2q"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113726"
}
],
"schema_version": "1.6.2",
"summary": "virtualenv activate runs commands from the environment name in zsh with PROMPT_SUBST"
}
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