{
  "cveId": "CVE-2026-27448",
  "url": "https://patchblox.com/security/cve/CVE-2026-27448",
  "summary": "CVE-2026-27448 is fixed in 7 products on 1 platform, first by python-openssl 17.5.0-1ubuntu1\u002Besm1, released March 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
  "description": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to \u0060set_tlsext_servername_callback\u0060 raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.",
  "published": "2026-03-17T17:00:00Z",
  "severity": "Low",
  "cvss": 5.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "cwe": "Not Failing Securely (\u0027Failing Open\u0027)",
  "epss": 0.00256,
  "epssPercentile": 0.17337,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27448",
  "fixes": [
    {
      "platform": "linux",
      "product": "pyopenssl",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "25.0.0-1\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-27448",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27448",
      "released": "2026-03-18T00:16:19Z"
    },
    {
      "platform": "linux",
      "product": "pyopenssl",
      "release": "Debian 14",
      "fixedVersion": "26.0.0-1",
      "fix": "DEBIAN-CVE-2026-27448",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27448",
      "released": "2026-03-18T00:16:19Z"
    },
    {
      "platform": "linux",
      "product": "python-openssl",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "17.5.0-1ubuntu1\u002Besm1",
      "fix": "python-openssl 17.5.0-1ubuntu1\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-openssl-17.5.0-1ubuntu1-esm1",
      "released": "2026-03-17T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python-openssl",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "19.0.0-1ubuntu0.1~esm1",
      "fix": "python-openssl 19.0.0-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python-openssl-19.0.0-1ubuntu0.1-esm1",
      "released": "2026-03-17T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python-pyOpenSSL",
      "release": "opensuse-leap 15.6",
      "fixedVersion": "23.2.0-150400.3.13.1",
      "fix": "SUSE-SU-2026:1192-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-1192-1",
      "released": "2026-04-07T08:39:34Z"
    },
    {
      "platform": "linux",
      "product": "python-pyOpenSSL",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "25.0.0-160000.3.1",
      "fix": "OPENSUSE-SU-2026:20419-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20419-1",
      "released": "2026-03-25T03:41:43Z"
    },
    {
      "platform": "linux",
      "product": "python-pyOpenSSL",
      "release": "sles 15.6",
      "fixedVersion": "23.2.0-150400.3.13.1",
      "fix": "SUSE-SU-2026:1192-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-1192-1",
      "released": "2026-04-07T08:39:34Z"
    },
    {
      "platform": "linux",
      "product": "python-pyOpenSSL",
      "release": "sles 15.7",
      "fixedVersion": "23.2.0-150400.3.13.1",
      "fix": "SUSE-SU-2026:1192-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-1192-1",
      "released": "2026-04-07T08:39:34Z"
    },
    {
      "platform": "linux",
      "product": "python-pyOpenSSL",
      "release": "sles 16.0",
      "fixedVersion": "25.0.0-160000.3.1",
      "fix": "SUSE-SU-2026:20930-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-20930-1",
      "released": "2026-03-25T03:41:42Z"
    },
    {
      "platform": "linux",
      "product": "python3-openssl",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "17.5.0-1ubuntu1\u002Besm1",
      "fix": "python3-openssl 17.5.0-1ubuntu1\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-openssl-17.5.0-1ubuntu1-esm1",
      "released": "2026-03-17T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-openssl",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "19.0.0-1ubuntu0.1~esm1",
      "fix": "python3-openssl 19.0.0-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-openssl-19.0.0-1ubuntu0.1-esm1",
      "released": "2026-03-17T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-openssl",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "21.0.0-1ubuntu0.1",
      "fix": "python3-openssl 21.0.0-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-python3-openssl-21.0.0-1ubuntu0.1",
      "released": "2026-04-15T18:59:27Z"
    },
    {
      "platform": "linux",
      "product": "python3-openssl",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "23.2.0-1ubuntu0.1",
      "fix": "python3-openssl 23.2.0-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-openssl-23.2.0-1ubuntu0.1",
      "released": "2026-04-15T18:59:29Z"
    },
    {
      "platform": "linux",
      "product": "python3-openssl",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "25.0.0-1ubuntu0.1",
      "fix": "python3-openssl 25.0.0-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-python3-openssl-25.0.0-1ubuntu0.1",
      "released": "2026-04-15T18:59:31Z"
    },
    {
      "platform": "linux",
      "product": "python3-pyOpenSSL",
      "release": "ol 9",
      "fixedVersion": "0:19.0.0-1.0.3.el9",
      "fix": "ELSA-2026-50324",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-50324",
      "released": "2026-06-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-pyOpenSSL",
      "release": "sles 15.7",
      "fixedVersion": "21.0.0-150400.22.1",
      "fix": "SUSE-SU-2026:3424-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3424-1",
      "released": "2026-07-30T11:07:52Z"
    },
    {
      "platform": "linux",
      "product": "python39-oci-sdk",
      "release": "ol 9",
      "fixedVersion": "0:2.187.0-1.0.5.el9",
      "fix": "ELSA-2026-604898",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-604898",
      "released": "2026-11-07T00:52:27Z"
    },
    {
      "platform": "linux",
      "product": "python39-oci-sdk-docs",
      "release": "ol 9",
      "fixedVersion": "0:2.187.0-1.0.5.el9",
      "fix": "ELSA-2026-604898",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-604898",
      "released": "2026-11-07T00:52:27Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}