{
  "cveId": "CVE-2026-9545",
  "url": "https://patchblox.com/security/cve/CVE-2026-9545",
  "summary": "CVE-2026-9545 is fixed in 13 products on 1 platform, first by curl 8.18.0-1ubuntu2.2, released June 26, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "exposing HTTP/3 early data",
  "description": "In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker\u0027s impostor machine - without a valid certificate.  When libcurl returns to the hostname the second time with a cached SSL session (\u0060CURLOPT_SSL_SESSIONID_CACHE\u0060 is not disabled) and early data enabled (the \u0060CURLSSLOPT_EARLYDATA\u0060 bit is set in \u0060CURLOPT_SSL_OPTIONS\u0060), libcurl might send off the second request\u0027s bytes on that new connection *before* enforcing the certificate verification failure. Potentially leaking sensitive information.",
  "published": "2026-06-24T07:00:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
  "epss": 0.00408,
  "epssPercentile": 0.35327,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-9545",
  "fixes": [
    {
      "platform": "linux",
      "product": "curl",
      "release": "Debian 14",
      "fixedVersion": "8.21.0~rc2-1",
      "fix": "DEBIAN-CVE-2026-9545",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-9545",
      "released": "2026-07-24T13:34:41Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "8.14.1-2ubuntu1.4",
      "fix": "curl 8.14.1-2ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-curl-8.14.1-2ubuntu1.4",
      "released": "2026-07-03T14:54:58Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.2",
      "fix": "curl 8.18.0-1ubuntu2.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-curl-8.18.0-1ubuntu2.2",
      "released": "2026-06-26T07:00:00Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "8.14.1-160000.8.1",
      "fix": "OPENSUSE-SU-2026:21272-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21272-1",
      "released": "2026-07-08T13:46:40Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "sles 15.6",
      "fixedVersion": "8.14.1-150600.4.46.1",
      "fix": "SUSE-SU-2026:2926-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2926-1",
      "released": "2026-07-13T17:55:13Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "sles 15.7",
      "fixedVersion": "8.14.1-150700.7.20.1",
      "fix": "SUSE-SU-2026:2925-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2925-1",
      "released": "2026-07-13T17:53:28Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "sles 16.0",
      "fixedVersion": "8.14.1-160000.8.1",
      "fix": "SUSE-SU-2026:22582-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22582-1",
      "released": "2026-07-08T13:46:31Z"
    },
    {
      "platform": "linux",
      "product": "curl-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "curl-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "curl-mini",
      "release": "sles 16.0",
      "fixedVersion": "8.14.1-160000.8.1",
      "fix": "SUSE-SU-2026:22582-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22582-1",
      "released": "2026-07-08T13:46:31Z"
    },
    {
      "platform": "linux",
      "product": "curl-minimal",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "curl-minimal-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-devel",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-minimal",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-minimal-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.21.0-5.amzn2023.0.1",
      "fix": "ALAS2023-2026-2132",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2132",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3t64-gnutls",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "8.14.1-2ubuntu1.4",
      "fix": "libcurl3t64-gnutls 8.14.1-2ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libcurl3t64-gnutls-8.14.1-2ubuntu1.4",
      "released": "2026-07-03T14:54:58Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3t64-gnutls",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.2",
      "fix": "libcurl3t64-gnutls 8.18.0-1ubuntu2.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libcurl3t64-gnutls-8.18.0-1ubuntu2.2",
      "released": "2026-06-26T07:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4t64",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "8.14.1-2ubuntu1.4",
      "fix": "libcurl4t64 8.14.1-2ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libcurl4t64-8.14.1-2ubuntu1.4",
      "released": "2026-07-03T14:54:58Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.2",
      "fix": "libcurl4t64 8.18.0-1ubuntu2.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.2",
      "released": "2026-06-26T07:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}