{"cve":"CVE-2026-102930","nvd":{"published":"2026-09-29T21:17:18.740","modified":"2026-09-30T19:38:27.293","status":"Awaiting Analysis","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":7.7},"cvss_v3":null,"cwes":["CWE-494"],"references":["https://github.com/pypa/virtualenv/commit/a01ed3e2f239d6ab1fce62c5c7664ccf268fff6d","https://github.com/pypa/virtualenv/pull/3251","https://github.com/pypa/virtualenv/security/advisories/GHSA-94p9-xgh2-xp45"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:48.555445741+00:00"},"epss":{"cve":"CVE-2026-102930","score":0.00197,"percentile":0.09269,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-94p9-xgh2-xp45","url":"https://osv.dev/vulnerability/GHSA-94p9-xgh2-xp45","summary":"virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use","modified":"2026-10-06T15:26:06.490658879Z","packages":[{"ecosystem":"PyPI","name":"virtualenv","purl":"pkg:pypi/virtualenv","ranges":["<21.7.12"],"fixed":["21.7.12"]}]},{"id":"PYSEC-2026-4011","url":"https://osv.dev/vulnerability/PYSEC-2026-4011","summary":"Downloaded seed wheels (pip/setuptools) are not integrity-checked before use","modified":"2026-10-06T15:26:06.490658879Z","packages":[{"ecosystem":"PyPI","name":"virtualenv","purl":"pkg:pypi/virtualenv","ranges":["<21.7.12"],"fixed":["21.7.12"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}