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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade python-virtualenv | Jul 23, 2026 | Jul 23, 2026 |
| Freebsd | — | Upgrade py313t-virtualenvUpgrade py313-virtualenvUpgrade py312-virtualenvUpgrade py311-virtualenvUpgrade py314-virtualenvUpgrade py310-virtualenv | Jan 27, 2026 | Jan 12, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-virtualenv | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Jan 10, 2026 |
| Suse | — | Upgrade python311-virtualenvUpgrade python313-virtualenv | Jan 23, 2026 | Jan 23, 2026 |
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