medium5.3
CVE-2026-6357
pip prior to version 26.1 would run self-update check functionality after installing wheel files which required importing well-known Python modules names.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pip | < 26.1 | 26.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jp4c-xjxw-mgf9
- https://nvd.nist.gov/vuln/detail/CVE-2026-6357
- https://github.com/pypa/pip/pull/13923
- https://ichard26.github.io/blog/2026/04/whats-new-in-pip-26.1/#security-fixes
- http://www.openwall.com/lists/oss-security/2026/04/27/7
- https://github.com/pypa/pip/commit/b369bfc96cc524e00c267e1693290e6599c36bad