Download of Code Without Integrity Check Affecting py3.13-virtualenv package, versions <21.7.12-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.16% (5th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-PY313VIRTUALENV-20373233
  • published2 Oct 2026
  • disclosed29 Sept 2026

Introduced: 29 Sep 2026

NewCVE-2026-102930  (opens in a new tab)
CWE-494  (opens in a new tab)

How to fix?

Upgrade Minimos:latest py3.13-virtualenv to version 21.7.12-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream py3.13-virtualenv package and not the py3.13-virtualenv package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

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 Base Scores

version 3.1