CVE-2026-113716
mediumvirtualenv is a tool for creating isolated virtual python environments.
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the builtin creator calls ensure_dir() for executable, library, and package directories, and ensure_dir() accepts an existing symlink to a directory because exists() follows it. Interpreter creation, seed installation, and activation generation then write through the linked parent outside the requested destination when another local account prepared the tree and the invoking user can access the target. The --clear option removes the planted tree first, while ordinary creation reaches it; arbitrary attacker-selected output bytes are not established. This issue is fixed in version 21.14.9.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/pypa/virtualenv/commit/554d9f9d4f7758f5cf53f993031e29787f1f74c5 security-advisories@github.com
- https://github.com/pypa/virtualenv/pull/3429 security-advisories@github.com
- https://github.com/pypa/virtualenv/releases/tag/21.14.9 security-advisories@github.com
- https://github.com/pypa/virtualenv/security/advisories/GHSA-cw65-gx24-rc82 security-advisories@github.com