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Advisory record · GHSA-6q48-6c7w-9gw2

certifi bundles emSign root CAs with compromised intermediate CA keys

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 20 Oct 2026, 21:41 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
certifiPyPI>=2019.03.09, <2026.10.182026.10.18
Identifiers
GHSA-6q48-6c7w-9gw2 · PYSEC-2026-4320
Published
20 Oct 2026
Updated
30 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Certifi versions from 2019.03.09 before 2026.10.18 bundle the emSign ECC Root CA - G3 root certificate, and eight eMudhra intermediate CA certificates chaining to it have compromised private keys that the CA has revoked. An attacker holding one of those keys could issue certificates for any hostname and, if also positioned on-path, intercept or modify TLS traffic from clients that trust the bundle, such as requests, urllib3, pip, and the Python.org macOS installer. Upgrade to certifi 2026.10.19 or later, and rebuild container images that vendor certifi.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
Not published None 4.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N OSV
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.