CVE-2026-6357

pip self-update functionality can import newly installed modules after wheel installation

CVSS 5.3 MEDIUMEPSS 0.1%CWE-829

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.3EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

27 Apr 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Affected products

Pip maintainers · pip

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References

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