[ CVE-2026-102930 · Published 29 Sep 2026 ]
virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use
[ Description ]Official description
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.
[ Fixes ]Fixes and patches
- virtualenv 21.7.12Fixed version · GitHub Advisories · pip package virtualenv: upgrade to 21.7.12 or later (affected <= 21.7.11)
[ Advisories ]Government CERT advisories
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BSI CERT-BundWID-SEC-2026-4111
Red Hat Ansible Automation Platform: Multiple vulnerabilities Translated from German
[ Packages ]Affected open-source packages
- virtualenv pipAffected <= 21.7.11 · fixed in 21.7.12 · GHSA-94p9-xgh2-xp45