virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use

downloadwheel runs pip download and hands the result straight to the seeder, with nothing checking the bytes it gets back. The embedded pip and setuptools wheels carry a BUNDLESHA256 that virtualenv checks on every load, but a wheel fetched over the network for the periodic-update feature or the...

Downloaded seed wheels (pip/setuptools) are not integrity-checked before use

downloadwheel runs pip download and hands the result straight to theseeder, with nothing checking the bytes it gets back. The embedded pip andsetuptools wheels carry a BUNDLESHA256 that virtualenv checks on every load,but a wheel fetched over the network for the periodic-update feature or...

PYSEC-2026-4011 Downloaded seed wheels (pip/setuptools) are not integrity-checked before use

downloadwheel runs pip download and hands the result straight to the seeder, with nothing checking the bytes it gets back. The embedded pip and setuptools wheels carry a BUNDLESHA256 that virtualenv checks on every load, but a wheel fetched over the network for the periodic-update feature or the...

AZL-94335 CVE-2026-13346 affecting package python-pip for versions less than 24.2-10

pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels. This vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone...

PYSEC-2026-3721

pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels.This vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone a...

PT-2026-80687

pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels. This vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone...

CVE-2026-13346: Absolute Path Traversal

pip would incorrectly handle doubly-encoded package URLs from indexes allowing for files to be installed to arbitrary locations on disk even when installing wheels. This vulnerability requires downloading or installing a package from a malicious package index to succeed, malicious packages alone...

Warning: PyPI Feature Executes Code Automatically After Python Package Download

In another finding that could expose developers to increased risk of a supply chain attack, it has emerged that nearly one-third of the packages in PyPI, the Python Package Index, trigger automatic code execution upon downloading them. "A worrying feature in pip/PyPI allows code to automatically...

python-pip: directory traversal in _download_http_url() function in src/pip/_internal/download.py

A flaw was found in the pip package installer for Python when downloading or installing a remote package via a specified URL. Improper validation of the "Content-Disposition" HTTP response header makes a path traversal attack possible, leading to an arbitrary file overwrite. This flaw allows an...