CVE-2026-102930
virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use
Impact
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.12, download_wheel() accepts pip and setuptools seed wheels fetched for periodic updates or the --download option without checking their bytes against an authoritative digest equivalent to the embedded wheels' BUNDLE_SHA256 verification. A compromised index, stale mirror, or intercepted TLS connection can substitute a different wheel under the requested distribution, version, and filename, after which virtualenv caches and seeds the attacker-controlled wheel into subsequently created environments. The verification applies to the default PyPI path and is intentionally skipped when PIP_INDEX_URL, PIP_EXTRA_INDEX_URL, or PIP_INDEX configures a custom index that may legitimately publish rebuilt wheels. This issue is fixed in version 21.7.12.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | virtualenv | <= 21.7.11 | 21.7.12 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-94p9-xgh2-xp45
- https://github.com/pypa/virtualenv/security/advisories/GHSA-94p9-xgh2-xp45
- https://nvd.nist.gov/vuln/detail/CVE-2026-102930
- https://github.com/pypa/virtualenv/pull/3251
- https://github.com/pypa/virtualenv/commit/a01ed3e2f239d6ab1fce62c5c7664ccf268fff6d
- https://github.com/pypa/advisory-database/tree/main/vulns/virtualenv/PYSEC-2026-4011.yaml
- https://github.com/pypa/virtualenv
- https://github.com/pypa/virtualenv/releases/tag/21.7.12
- https://pypi.org/project/virtualenv