Home/CVE/pip prior to version 26.1 would run self-update check functionality after installing wheel files which required importin
CVE

CVE-2026-6357

pip prior to version 26.1 would run self-update check functionality after installing wheel files which required importin

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.

EPSS 0.00017
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-829Inclusion of Functionality from Untrusted Control Sphere
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI pip MODERATE fixed in 26.1
▣

Scoring & Timeline

Published to NVD27 Apr 2026 · 03:16 PM
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
msrcCVE-2026-6357
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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
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