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cve.new
GHSA-6q48-6c7w-9gw2critical9.1

certifi bundles emSign root CAs with compromised intermediate CA keys

No CVE assignedCheck your stack

The advisory, in context

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.

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

Ecosystem versions

From 2019.03.09 before 2026.10.18

Fixed in 2026.10.18

42 explicitly affected versions

2019.11.28, 2019.3.9, 2019.6.16, 2019.9.11, 2020.11.8, 2020.12.5, 2020.4.5, 2020.4.5.1, 2020.4.5.2, 2020.6.20, 2021.10.8, 2021.5.30, 2022.12.7, 2022.5.18, 2022.5.18.1, 2022.6.15, 2022.6.15.1, 2022.6.15.2, 2022.9.14, 2022.9.24, 2023.11.17, 2023.5.7, 2023.7.22, 2024.12.14, 2024.2.2, 2024.6.2, 2024.7.4, 2024.8.30, 2025.1.31, 2025.10.5, 2025.11.12, 2025.4.26, 2025.6.15, 2025.7.14, 2025.7.9, 2025.8.3, 2026.1.4, 2026.2.25, 2026.4.22, 2026.5.20, 2026.6.17, 2026.7.22

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "2019.03.09"
        },
        {
          "fixed": "2026.10.18"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "2019.11.28",
    "2019.3.9",
    "2019.6.16",
    "2019.9.11",
    "2020.11.8",
    "2020.12.5",
    "2020.4.5",
    "2020.4.5.1",
    "2020.4.5.2",
    "2020.6.20",
    "2021.10.8",
    "2021.5.30",
    "2022.12.7",
    "2022.5.18",
    "2022.5.18.1",
    "2022.6.15",
    "2022.6.15.1",
    "2022.6.15.2",
    "2022.9.14",
    "2022.9.24",
    "2023.11.17",
    "2023.5.7",
    "2023.7.22",
    "2024.12.14",
    "2024.2.2",
    "2024.6.2",
    "2024.7.4",
    "2024.8.30",
    "2025.1.31",
    "2025.10.5",
    "2025.11.12",
    "2025.4.26",
    "2025.6.15",
    "2025.7.14",
    "2025.7.9",
    "2025.8.3",
    "2026.1.4",
    "2026.2.25",
    "2026.4.22",
    "2026.5.20",
    "2026.6.17",
    "2026.7.22"
  ]
}

References