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BIT-virtualenv-2026-113717 — virtualenv: Pip seeding with download omits wheel digest verification

Affected: Bitnami: virtualenv

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, PipInvoke.get_pip_install_cmd() handles --seeder pip --download by calling get_wheel(download=False) and then allowing pip to consult the configured index, bypassing virtualenv's download_wheel() and verify_wheel_digest() path. When virtualenv's default-index PyPI digest comparison remains enabled, an index candidate matching the bundled package and version can therefore be selected without comparison to PyPI SHA-256 metadata. Explicit custom-index settings already opt out of that comparison and remain outside this verification-bypass claim; the demonstrated configuration used a non-PyPI index while leaving the index environment variables unset so the comparison policy remained active. This condition does not independently defeat TLS or establish control of the index response. This issue is fixed in version 21.14.9.

CVE-2026-113717 — virtualenv: Pip seeding with download omits wheel digest verification

Affected: pypa virtualenv

GHSA-cx28-75q4-x26q — virtualenv: Pip seeding with download omits wheel digest verification

Affected: PyPI: virtualenv

## Summary

The pip seeder acquires bundled wheels with download=False and lets pip access the index when --download is selected. Index candidates on that path do not pass through virtualenv's wheel digest verification.

Anthropic's OSS Scanner reported this as `ANT-2026-74ALJBUF` in `virtualenv-20261015-005`, received on 15 October 2026.

## Affected area

Wheel selection by the pip seeder when downloads are enabled.

## Attacker-controlled input

The pip seeder and download option must be selected. The finding concerns the default-index digest-verification policy. Explicit custom-index settings already opt out of comparison against PyPI metadata; this patch retains that policy.

## Affected code

The relevant 21.14.8 source is in [pip seeder](https://github.com/pypa/virtualenv/blob/a795ab116356afde11039cf2763d77e8a06da738/src/virtualenv/seed/embed/pip_invoke.py).

## Mechanism

With `--seeder pip --download`, `PipInvoke.get_pip_install_cmd()` first calls `get_wheel(download=False)`, so virtualenv's `download_wheel()` and `verify_wheel_digest()` are skipped. It then lets `pip install` consult the configured index. An index wheel with the same package and version as the bundled wheel can be selected without virtualenv comparing its SHA-256 with PyPI metadata. The default app-data seeder takes the verification path for the same option.

## Reproduction and evidence

The scanner built a local index named in `pip.conf` that served a modified copy of the bundled pip wheel under…