2.3 Low

virtualenv: Pip seeding with download omits wheel digest verification

CVE-2026-113717

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/pipinvoke.py). Mechanism With --seeder pip --download, PipInvoke.getpipinstallcmd() first calls getwheel(download=False), so virtualenv's downloadwheel() and verifywheeldigest() 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…

Assessment

CVSS: 2.3 (v4.0)
Severity: Low
EPSS: 0.00293% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 23 October 2026
Last updated: 23 October 2026
Affected: pip · virtualenv
Weakness: CWE-494

CVSS vectorCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

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