{
  "cveId": "CVE-2026-86409",
  "url": "https://patchblox.com/security/cve/CVE-2026-86409",
  "summary": "CVE-2026-86409 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2026-86409, released October 16, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "stale SigV4 headers sent unintended",
  "description": "Setting \u0060CURLOPT_AWS_SIGV4\u0060 to NULL but does not disable SigV4 authentication, contrary to expectations and documentation. A subsequent transfer on the same handle still sends an \u0060Authorization: AWS4-HMAC-SHA256\u0060 header to whatever URL isset next, leaking state information.",
  "published": "2026-10-13T23:00:00Z",
  "severity": "Low",
  "cvss": 8.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.01096,
  "epssPercentile": 0.65778,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-86409",
  "fixes": [
    {
      "platform": "linux",
      "product": "curl",
      "release": "Debian 14",
      "fixedVersion": "8.22.0-1",
      "fix": "DEBIAN-CVE-2026-86409",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-86409",
      "released": "2026-10-16T15:52:00Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "7.81.0-1ubuntu1.30",
      "fix": "curl 7.81.0-1ubuntu1.30",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.30",
      "released": "2026-10-21T16:55:05Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "8.5.0-2ubuntu10.16",
      "fix": "curl 8.5.0-2ubuntu10.16",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-curl-8.5.0-2ubuntu10.16",
      "released": "2026-10-21T16:55:08Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.8",
      "fix": "curl 8.18.0-1ubuntu2.8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-curl-8.18.0-1ubuntu2.8",
      "released": "2026-11-07T00:38:05Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "sles 15.6",
      "fixedVersion": "8.22.0-150600.4.58.1",
      "fix": "SUSE-SU-2026:5069-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5069-1",
      "released": "2026-11-07T00:42:08Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "sles 15.7",
      "fixedVersion": "8.22.0-150700.7.33.1",
      "fix": "SUSE-SU-2026:5068-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5068-1",
      "released": "2026-11-07T00:43:02Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3-gnutls",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "7.81.0-1ubuntu1.30",
      "fix": "libcurl3-gnutls 7.81.0-1ubuntu1.30",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.30",
      "released": "2026-10-21T16:55:05Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3-nss",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "7.81.0-1ubuntu1.30",
      "fix": "libcurl3-nss 7.81.0-1ubuntu1.30",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.30",
      "released": "2026-10-21T16:55:05Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3t64-gnutls",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "8.5.0-2ubuntu10.16",
      "fix": "libcurl3t64-gnutls 8.5.0-2ubuntu10.16",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libcurl3t64-gnutls-8.5.0-2ubuntu10.16",
      "released": "2026-10-21T16:55:08Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3t64-gnutls",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.8",
      "fix": "libcurl3t64-gnutls 8.18.0-1ubuntu2.8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libcurl3t64-gnutls-8.18.0-1ubuntu2.8",
      "released": "2026-11-07T00:38:05Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "7.81.0-1ubuntu1.30",
      "fix": "libcurl4 7.81.0-1ubuntu1.30",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.30",
      "released": "2026-10-21T16:55:05Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4t64",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "8.5.0-2ubuntu10.16",
      "fix": "libcurl4t64 8.5.0-2ubuntu10.16",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libcurl4t64-8.5.0-2ubuntu10.16",
      "released": "2026-10-21T16:55:08Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.8",
      "fix": "libcurl4t64 8.18.0-1ubuntu2.8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.8",
      "released": "2026-11-07T00:38:05Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}