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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
certifi	==2026.7.22 → ==2026.10.18

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certifi bundles emSign root CAs with compromised intermediate CA keys

GHSA-6q48-6c7w-9gw2 / PYSEC-2026-4320

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/certifi/python-certifi

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

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certifi bundles emSign root CAs with compromised intermediate CA keys

GHSA-6q48-6c7w-9gw2 / PYSEC-2026-4320

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/certifi/python-certifi
• https://pypi.org/project/certifi
• https://github.com/advisories/GHSA-6q48-6c7w-9gw2

This data is provided by OSV and the PyPI Advisory Database (CC-BY 4.0).

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Release Notes

certifi/python-certifi (certifi)

v2026.10.18

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