GHSA-6q48-6c7w-9gw2

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    GHSA-6q48-6c7w-9gw2

    Published: 20 Oct 2026Last Modified: 26 Oct 2026

    Summary: certifi bundles emSign root CAs with compromised intermediate CA keys

    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.

    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

    Affected packages

    Package

    Name: certifi

    Purl: pkg:pypi/certifi

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 2019.03.09
    Fixed -2026.10.18

    Affected versions

    2019.11.28

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High