[konih]

This PR contains the following updates:

Package	Change	Age	Confidence
certifi	2026.5.20 → 2026.10.18

---

certifi bundles emSign root CAs with compromised intermediate CA keys

GHSA-6q48-6c7w-9gw2

More information

Details

Certifi versions before 2026.10.18 include the emSign ECC Root CA - G3 root certificate in their bundled CA store. Eight eMudhra intermediate CA certificates that chain to this root have compromised private keys and the CA has revoked them.

An attacker with one of the compromised keys can issue valid-looking certificates for any hostname. If the attacker is also on-path, they can intercept or modify TLS traffic from clients that trust the certifi bundle. Examples include requests, urllib3 and pip, and the Python.org macOS installer.

Certifi 2026.10.18 removed all emSign roots from the bundle. Certifi 2026.10.19 restored the emSign roots that are not affected. Upgrade to 2026.10.19 or later, and rebuild container images that vendor certifi.

Severity

• CVSS Score: 9.1 / 10 (Critical)
• Vector String: 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

References

• https://github.com/certifi/python-certifi/security/advisories/GHSA-6q48-6c7w-9gw2
• https://discuss.python.org/t/information-for-python-users-regarding-emudhra-emsign-ca-certificate-security-incident/109576
• https://emudhra.we-have-a-problem.com
• https://github.com/advisories/GHSA-6q48-6c7w-9gw2

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

Release Notes

certifi/python-certifi (certifi)

v2026.10.18

Compare Source

v2026.7.22

Compare Source

v2026.6.17

Compare Source

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate CLI.

[konih]

Left open: dependency-review fails on licence policy, not on the bump itself. certifi 2026.10.18 is reported as MPL-2.0, which is not in the allow-licenses list in .github/workflows/ci.yaml. Merging needs an operator decision to allow certifi (a docs-build-only dependency) as a scoped allow-dependencies-licenses exception.