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Moderate severityOSV Advisory· Published Jan 10, 2026· Updated Jan 12, 2026

virtualenv Has TOCTOU Vulnerabilities in Directory Creation

CVE-2026-22702

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
virtualenvPyPI
< 20.36.120.36.1

Affected products

12

Patches

Vulnerability mechanics

References

5

News mentions

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