2.3 Low

virtualenv: Downloaded wheel selection and caching precede verification

CVE-2026-113714

Summary Wheel downloads go directly into the reusable wheelhouse, while the verification target is selected from pip's textual output. A verification failure does not remove the downloaded file from that cache. Anthropic's OSS Scanner reported this as ANT-2026-ST00DRO3 in virtualenv-20261015-005, received on 15 October 2026. Affected area Download selection and promotion into the reusable wheel cache. Attacker-controlled input A download must fail verification, or the archive selected from pip output must differ from the file later reused. Default-index digest verification must be enabled. Existing custom-index exceptions are outside the promised PyPI comparison. Affected code The relevant 21.14.8 source is in [wheel download and digest check](https://github.com/pypa/virtualenv/blob/a795ab116356afde11039cf2763d77e8a06da738/src/virtualenv/seed/wheels/acquire.py). Mechanism downloadwheel() tells pip to write directly into the reusable wheel/house cache. It then selects a path to hash from the first Saved line in pip's stdout, rather than from the file pip actually placed there. A package index can inject such a line through a discarded link's data-requires-python attribute. A…

Assessment

CVSS: 2.3 (v4.0)
Severity: Low
EPSS: 0.00249% 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-354

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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