BIT-virtualenv-2026-113720

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BIT-virtualenv-2026-113720

Summary: virtualenv: Seeded files retain permissions from an older cache

Details: 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.

References: https://github.com/pypa/virtualenv/commit/35f0b33562790176dd186d0a3c517af3acc7a0e1, 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, https://nvd.nist.gov/vuln/detail/CVE-2026-113720