https://github.com/pypa/virtualenv/security/advisories/GHSA-597g-3phw-6986 reports:
virtualenv is a tool for creating isolated virtual python environments.
Prior to version 20.36.1, TOCTOU (Time-of-Check-Time-of-Use)
vulnerabilities in virtualenv allow local attackers to perform
symlink-based attacks on directory creation operations. An attacker
with local access can exploit a race condition between directory
existence checks and creation to redirect virtualenv's app_data and
lock file operations to attacker-controlled locations. This issue
has been patched in version 20.36.1.