Improper Validation of Integrity Check Value Affecting virtualenv package, versions [21.14.8,21.14.9)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-VIRTUALENV-21282514
- published21 Oct 2026
- disclosed20 Oct 2026
- creditAnthropic's OSS Scanner
Introduced: 20 Oct 2026
NewCVE-2026-113714 (opens in a new tab)How to fix?
Upgrade virtualenv to version 21.14.9 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Integrity Check Value via the seed wheel acquisition logic in src/virtualenv/seed/wheels/acquire.py and pip_invoke.py, where wheels are cached and then passed to pip for installation without verifying their integrity before use. When the --find-links directories used by pip contain multiple wheel files matching a distribution, pip selects among them by filename, allowing a wheel that was placed in the cache directory prior to digest verification to be installed instead of the expected, verified wheel. An attacker who can write to the shared wheel cache directory can substitute a malicious wheel that pip then installs into the new virtual environment.