{"id":"CVE-2026-113726","summary":"virtualenv activate runs commands from the environment name in zsh with PROMPT_SUBST","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'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.","aliases":["GHSA-5vjq-rrrf-7h2q"],"modified":"2026-10-21T10:45:52.173415423Z","published":"2026-10-20T22:05:24.253Z","database_specific":{"cwe_ids":["CWE-116","CWE-78"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113726.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113726.json"},{"type":"FIX","url":"https://github.com/pypa/virtualenv/commit/5b915367da82bd024b2a0d28d2f98007034b4aa2"},{"type":"WEB","url":"https://github.com/pypa/virtualenv/releases/tag/21.14.4"},{"type":"ADVISORY","url":"https://github.com/pypa/virtualenv/security/advisories/GHSA-5vjq-rrrf-7h2q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113726"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/pypa/virtualenv","events":[{"introduced":"0"},{"fixed":"6657c5876b2185fd3feb77c1f03ec58246321c36"},{"fixed":"5b915367da82bd024b2a0d28d2f98007034b4aa2"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"21.14.4"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"5b915367da82bd024b2a0d28d2f98007034b4aa2"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"6657c5876b2185fd3feb77c1f03ec58246321c36"}],"source":"REFERENCES_TAG","original_tag":"21.14.4"}]}}],"versions":["21.14.3","21.14.2","21.14.1","21.14.0","21.13.0","21.12.1","21.12.0","21.11.1","21.11.0","21.10.0","21.9.1","21.9.0","21.8.1","21.8.0","21.7.16","21.7.15","21.7.14","21.7.13","21.7.12","21.7.11","21.7.10","21.7.9","21.7.8","21.7.7","21.7.6","21.7.5","21.7.4","21.7.3","21.7.2","21.7.1","21.7.0","21.6.1","21.6.0","21.5.2","21.5.1","21.5.0","21.4.3","21.4.2","21.4.1","21.4.0","21.3.3","21.3.2","21.3.1","21.3.0","21.2.4","21.2.3","21.2.2","21.2.1","21.2.0","21.1.0","21.0.0","20.39.1","20.39.0","20.38.0","20.37.0","20.27.3","20.27.2","20.24.3","20.3.0","20.0.32","20.0.7","20.0.0b2","20.0.0b1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-113726.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}