certifi bundles emSign root CAs with compromised intermediate CA keys

Date Oct 20, 2026
Type Vendor advisory
Signal Critical vendor advisory
Vendor / Product PyPI · certifi
Critical vendor advisory

Summary

certifi bundles emSign root CAs with compromised intermediate CA keys

Why it matters

GitHub has published a reviewed security advisory for certifi. Prioritize it with other application dependency updates.

Operator check

Check whether certifi is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 9.1.

Sources

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.