Download of code without integrity check in py3-virtualenv - #VU151614
Published: September 22, 2026
Vulnerability identifier: #VU151614
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-494
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to download of code without integrity check in the download_wheel() function when downloading pip or setuptools seed wheels. A remote attacker can substitute a wheel served under the same distribution, version, and filename to execute arbitrary code.
The issue affects wheels retrieved through the periodic-update feature or the --download flag.
Affected software
py3-virtualenv
Remediation
Install security update from vendor's website.
py3-virtualenv - update to 21.7.12