pip Vulnerable to Inclusion of Functionality from Untrusted Control Sphere
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.
02 / AFFECTED SOFTWARE
Affected packages
154 explicit affected versions
154 explicit affected versions
25 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
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.
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.
05 / REFERENCES
Further evidence
- http://www.openwall.com/lists/oss-security/2026/04/27/7
- https://github.com/pypa/pip
- https://github.com/pypa/pip/commit/b369bfc96cc524e00c267e1693290e6599c36bad
- https://github.com/pypa/pip/pull/13923
- https://ichard26.github.io/blog/2026/04/whats-new-in-pip-26.1/#security-fixes
- https://nvd.nist.gov/vuln/detail/CVE-2026-6357
- https://github.com/advisories/GHSA-jp4c-xjxw-mgf9
- https://pypi.org/project/pip
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6357.json