Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/pypa/virtualenv/commit/35f0b33562790176dd186d0a3c517af3acc7a0
- https://github.com/pypa/virtualenv/pull/3425
- https://github.com/pypa/virtualenv/releases/tag/21.14.9
- https://github.com/pypa/virtualenv/security/advisories/GHSA-fc2g-4w5p-6whm
FAQ
What is CVE-2026-113720?
CVE-2026-113720 is a documented vulnerability. 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 cach...
How severe is CVE-2026-113720?
CVSS scoring is not yet available for CVE-2026-113720. Check NVD for updates.
Is there a patch for CVE-2026-113720?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.