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.
{
"severity": "MODERATE",
"cwe_ids": [
"CWE-829"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-05T22:05:46Z",
"nvd_published_at": "2026-04-27T15:16:20Z"
}