{"id":"CVE-2026-113720","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-113720","generatedAt":"2026-10-27T23:51:24.274Z","title":"A cache populated under a permissive umask can therefore produce files writable by another local account in a later traversable environment, allowing package code such as pip/__init__.py to be modified and executed by the environment owner.","description":"virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the app-data copy seeder uses shutil.copy() to copy cached package files into later environments, causing cached source modes to override the current run's umask. A cache populated under a permissive umask can therefore produce files writable by another local account in a later traversable environment, allowing package code such as pip/__init__.py to be modified and executed by the environment owner. The attacker cannot force the earlier umask, and a private destination parent prevents access. This issue is fixed in version 21.14.9.","published":"2026-10-20T20:17:18.000Z","lastModified":"2026-10-22T16:47:38.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":4.4,"severity":"MEDIUM","vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-732"],"affected":[],"epss":{"score":0.00134,"percentile":0.02847,"date":"2026-10-26","history":[{"date":"2026-10-21","score":0.00105,"percentile":0.0104}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-20T20:17:18.000Z","detail":{"score":"4.4","severity":"MEDIUM","publishedAt":"2026-10-20T20:17:18.493Z"},"summary":"New CVE, medium severity (CVSS 4.4)."}],"references":[{"url":"https://github.com/pypa/virtualenv/commit/35f0b33562790176dd186d0a3c517af3acc7a0e1","source":"security-advisories@github.com"},{"url":"https://github.com/pypa/virtualenv/pull/3425","source":"security-advisories@github.com"},{"url":"https://github.com/pypa/virtualenv/releases/tag/21.14.9","source":"security-advisories@github.com"},{"url":"https://github.com/pypa/virtualenv/security/advisories/GHSA-fc2g-4w5p-6whm","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-113720","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}