Download of code without integrity check in py3-virtualenv - CVE-2026-113717
Published: November 9, 2026
Vulnerability identifier: #VU163150
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-113717
CWE-ID: CWE-494
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an attacker controlling the configured package index to execute code as a user who later invokes pip in a seeded environment.
The vulnerability exists due to missing wheel digest verification in virtualenv's pip seeder when both --seeder pip and --download are selected. An attacker controlling the configured package index can serve a modified same-version pip wheel through an index configured in pip.conf, causing its installation without comparison against PyPI metadata.
Affected software
py3-virtualenv
How to mitigate CVE-2026-113717
Install security update from vendor's website.
py3-virtualenv - update to 21.14.9