virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use — GHSA-94P9-XGH2-XP45

Summary

`download_wheel()` runs `pip download` and hands the result straight to the seeder, with nothing checking the bytes it gets back. The embedded pip and setuptools wheels carry a `BUNDLE_SHA256` that virtualenv checks on every load, but a wheel fetched over the network for the periodic-update feature or the `--download` flag had no equivalent verification. A compromised index, a stale mirror, or a MITM'd download…

Timeline

Published by source

2026-09-30

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 7.7 out of 10.
• Review exposure for the affected product or family: pip: virtualenv.

Product

pip: virtualenv

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-94P9-XGH2-XP45

Source

GitHub

Vendor

GitHub

Published by source

2026-09-30

Last source activity

2026-09-30

Additional identifiers

CVE-2026-102930

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.