Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-94p9-xgh2-xp45

virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use

CVSS 7.7 HighEPSS 0.0020 · 9th percentile

Published by the GitHub Advisory Database at 30 Sept 2026, 23:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
virtualenvPyPI<21.7.1221.7.12
Identifiers
GHSA-94p9-xgh2-xp45 · BIT-virtualenv-2026-102930 · CVE-2026-102930 · PYSEC-2026-4011
Weakness (CWE)
CWE-494
Tags
Published
30 Sept 2026
Updated
6 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Virtualenv versions before 21.7.12 do not verify the integrity of pip and setuptools wheels downloaded over the network, for the periodic-update feature or the --download flag. An attacker who can substitute a wheel, through a compromised or stale index or by intercepting TLS, could get a different wheel seeded into newly created environments without any warning. Upgrade to virtualenv 21.7.12, which checks downloaded wheels against the digest PyPI reports for that release; the check is skipped when a custom index is configured, so that case is not covered.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.7 High 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 9th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.