CVE-2026-6357: Pip Maintainers Pip

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

pip prior to version 26.1 would run self-update check functionality after installing wheel files which required importing well-known Python modules names. These module imports were intentionally deferred to increase startup time of the pip CLI. The patch changes self-update functionality to run before wheels are installed to prevent newly-installed modules from being imported shortly after the installation of a wheel package. Users should still review package contents prior to installation.

Affected products

• Pip Maintainers Pip: before 26.1 (fixed in 26.1)

Published 2026-04-27. Last modified 2026-06-17.