{"id":"CVE-2026-113732","title":"virtualenv activate.fish runs commands from a path or prompt with a backslash before a quote","summary":"virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.2, FishActivator inherits ViaTemplateActivator.quote(), which uses POSIX shlex.quote() even though fish interprets backslashes and single quotes diffe…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-78","CWE-116"],"vendor":"pypa","product":"virtualenv","affected":["virtualenv < 21.14.2"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T22:01:23.931Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-113732","references":[{"url":"https://github.com/pypa/virtualenv/security/advisories/GHSA-c947-3pg5-gm8q","label":"https://github.com/pypa/virtualenv/security/advisories/GHSA-c947-3pg5-gm8q"},{"url":"https://github.com/pypa/virtualenv/commit/3bddeaf8d02c3ee7f576503efb082f8f494cfcab","label":"https://github.com/pypa/virtualenv/commit/3bddeaf8d02c3ee7f576503efb082f8f494cfcab"},{"url":"https://github.com/pypa/virtualenv/releases/tag/21.14.2","label":"https://github.com/pypa/virtualenv/releases/tag/21.14.2"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T22:23:33.690Z","slug":"CVE-2026-113732","body":"## Overview\n\nvirtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.2, FishActivator inherits ViaTemplateActivator.quote(), which uses POSIX shlex.quote() even though fish interprets backslashes and single quotes differently. An attacker-influenced environment path, --prompt, or VIRTUALENV_PROMPT value containing a backslash before a quote can therefore terminate the generated fish literal and execute command substitution when the user sources activate.fish. This issue is fixed in version 21.14.2.\n\n## Affected\n\n- `virtualenv < 21.14.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}