virtualenv Has TOCTOU Vulnerabilities in Directory Creation
Impact
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.
Affected versions: All versions up to and including 20.36.1
Affected users: Any user running virtualenv on multi-user systems where untrusted local users have filesystem access to shared temporary directories or where VIRTUALENV_OVERRIDE_APP_DATA points to a user-writable location.
Attack scenarios:
- Cache poisoning: Attacker corrupts wheels or Python metadata in the cache
- Information disclosure: Attacker reads sensitive cached data or metadata
- Lock bypass: Attacker controls lock file semantics to cause concurrent access violations
- Denial of service: Lock starvation preventing virtualenv operations
Patches
The vulnerability has been patched by replacing check-then-act patterns with atomic os.makedirs(..., exist_ok=True) operations.
Fixed in: PR #3013
Versions with the fix: 20.36.2 and later
Users should upgrade to version 20.36.2 or later.
Workarounds
If you cannot upgrade immediately:
- Ensure
VIRTUALENV_OVERRIDE_APP_DATApoints to a directory owned by the current user with restricted permissions (mode 0700) - Avoid running
virtualenvin shared temporary directories where other users have write access - Use separate user accounts for different projects to isolate app_data directories
References
- GitHub PR: https://github.com/pypa/virtualenv/pull/3013
- Vulnerability reported by: @tsigouris007
- CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (TOCTOU)
- CWE-59: Improper Link Resolution Before File Access
Czego dotyczy
Kliknij technologię, aby zobaczyć wszystkie dotyczące jej podatności.
| Platforma | Paczka | Podatne wersje | Poprawka w wersji |
|---|---|---|---|
| Python (PyPI) | virtualenv | < 20.36.1 | 20.36.1 |
Odnośniki
- https://github.com/pypa/virtualenv/security/advisories/GHSA-597g-3phw-6986
- https://nvd.nist.gov/vuln/detail/CVE-2026-22702
- https://github.com/pypa/virtualenv/pull/3013
- https://github.com/pypa/virtualenv/commit/dec4cec5d16edaf83a00a658f32d1e032661cebc
- https://github.com/pypa/virtualenv
- https://pypi.org/project/virtualenv
- https://github.com/advisories/GHSA-597g-3phw-6986
- Wektor CVSS
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L- Słabość (CWE)
CWE-362, CWE-59- Platforma
- Python (PyPI)
- Paczka
virtualenv- Ujawniono
- 13.01.2026
- Aktualizacja
- 11.10.2026 15:17
Źródła i licencje
OSV / GitHub Advisory Database - PYSEC-2026-2009 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-597g-3phw-6986 - CC BY 4.0
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