{
  "cveId": "CVE-2026-5545",
  "url": "https://patchblox.com/security/cve/CVE-2026-5545",
  "summary": "CVE-2026-5545 is fixed in 10 products on 1 platform, first by curl 7.68.0-1ubuntu2.25\u002Besm5, released April 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "wrong reuse of HTTP Negotiate connection",
  "description": "libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host.  libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead.  When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials.  An application that first uses Negotiate authentication to a server with \u0060user1:password1\u0060 and then does another operation to the same server asking for any authentication method but for \u0060user2:password2\u0060 (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1\u0027s and user2\u0027s credentials when it is in fact still using the connection authenticated for user1...",
  "published": "2026-04-29T00:00:00Z",
  "severity": "Moderate",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
  "epss": 0.00414,
  "epssPercentile": 0.35903,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-5545",
  "fixes": [
    {
      "platform": "linux",
      "product": "curl",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "8.14.1-2\u002Bdeb13u4",
      "fix": "DEBIAN-CVE-2026-5545",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-5545",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Debian 14",
      "fixedVersion": "8.20.0~rc2-1",
      "fix": "DEBIAN-CVE-2026-5545",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-5545",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "RHEL 10",
      "fixedVersion": "8.12.1-4.el10_2.7",
      "fix": "RHSA-2026:80512",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-80512",
      "released": "2026-07-03T06:11:15Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "7.68.0-1ubuntu2.25\u002Besm5",
      "fix": "curl 7.68.0-1ubuntu2.25\u002Besm5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-curl-7.68.0-1ubuntu2.25-esm5",
      "released": "2026-04-29T07:00:00Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "7.81.0-1ubuntu1.24",
      "fix": "curl 7.81.0-1ubuntu1.24",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.24",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "8.5.0-2ubuntu10.9",
      "fix": "curl 8.5.0-2ubuntu10.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-curl-8.5.0-2ubuntu10.9",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "8.14.1-2ubuntu1.3",
      "fix": "curl 8.14.1-2ubuntu1.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-curl-8.14.1-2ubuntu1.3",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.1",
      "fix": "curl 8.18.0-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-curl-8.18.0-1ubuntu2.1",
      "released": "2026-04-29T07:00:00Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "almalinux 10",
      "fixedVersion": "8.12.1-4.el10_2.7",
      "fix": "ALSA-2026:80512",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-80512",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "ol 10",
      "fixedVersion": "0:8.12.1-4.el10_2.7",
      "fix": "ELSA-2026-80512",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-80512",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "8.14.1-160000.6.1",
      "fix": "OPENSUSE-SU-2026:20973-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20973-1",
      "released": "2026-06-17T08:47:34Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "rocky 10",
      "fixedVersion": "0:8.12.1-4.el10_2.7",
      "fix": "RLSA-2026:80512",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-80512",
      "released": "2026-11-07T00:39:51Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "sles 15.7",
      "fixedVersion": "8.14.1-150700.7.23.1",
      "fix": "SUSE-SU-2026:3798-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3798-1",
      "released": "2026-08-25T12:41:04Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "sles 16.0",
      "fixedVersion": "8.14.1-160000.6.1",
      "fix": "SUSE-SU-2026:22156-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22156-1",
      "released": "2026-06-17T08:57:16Z"
    },
    {
      "platform": "linux",
      "product": "curl-mini",
      "release": "sles 16.0",
      "fixedVersion": "8.14.1-160000.6.1",
      "fix": "SUSE-SU-2026:22156-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22156-1",
      "released": "2026-06-17T08:57:16Z"
    },
    {
      "platform": "linux",
      "product": "libcurl",
      "release": "almalinux 10",
      "fixedVersion": "8.12.1-4.el10_2.7",
      "fix": "ALSA-2026:80512",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-80512",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libcurl",
      "release": "ol 10",
      "fixedVersion": "0:8.12.1-4.el10_2.7",
      "fix": "ELSA-2026-80512",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-80512",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-devel",
      "release": "almalinux 10",
      "fixedVersion": "8.12.1-4.el10_2.7",
      "fix": "ALSA-2026:80512",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-80512",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-devel",
      "release": "ol 10",
      "fixedVersion": "0:8.12.1-4.el10_2.7",
      "fix": "ELSA-2026-80512",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-80512",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-minimal",
      "release": "almalinux 10",
      "fixedVersion": "8.12.1-4.el10_2.7",
      "fix": "ALSA-2026:80512",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-80512",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-minimal",
      "release": "ol 10",
      "fixedVersion": "0:8.12.1-4.el10_2.7",
      "fix": "ELSA-2026-80512",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-80512",
      "released": "2026-11-07T00:59:15Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3-gnutls",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "7.68.0-1ubuntu2.25\u002Besm5",
      "fix": "libcurl3-gnutls 7.68.0-1ubuntu2.25\u002Besm5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libcurl3-gnutls-7.68.0-1ubuntu2.25-esm5",
      "released": "2026-04-29T07:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3-gnutls",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "7.81.0-1ubuntu1.24",
      "fix": "libcurl3-gnutls 7.81.0-1ubuntu1.24",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.24",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3-nss",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "7.68.0-1ubuntu2.25\u002Besm5",
      "fix": "libcurl3-nss 7.68.0-1ubuntu2.25\u002Besm5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libcurl3-nss-7.68.0-1ubuntu2.25-esm5",
      "released": "2026-04-29T07:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3-nss",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "7.81.0-1ubuntu1.24",
      "fix": "libcurl3-nss 7.81.0-1ubuntu1.24",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.24",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3t64-gnutls",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "8.5.0-2ubuntu10.9",
      "fix": "libcurl3t64-gnutls 8.5.0-2ubuntu10.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libcurl3t64-gnutls-8.5.0-2ubuntu10.9",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3t64-gnutls",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "8.14.1-2ubuntu1.3",
      "fix": "libcurl3t64-gnutls 8.14.1-2ubuntu1.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libcurl3t64-gnutls-8.14.1-2ubuntu1.3",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "libcurl3t64-gnutls",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.1",
      "fix": "libcurl3t64-gnutls 8.18.0-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libcurl3t64-gnutls-8.18.0-1ubuntu2.1",
      "released": "2026-04-29T07:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "7.68.0-1ubuntu2.25\u002Besm5",
      "fix": "libcurl4 7.68.0-1ubuntu2.25\u002Besm5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libcurl4-7.68.0-1ubuntu2.25-esm5",
      "released": "2026-04-29T07:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "7.81.0-1ubuntu1.24",
      "fix": "libcurl4 7.81.0-1ubuntu1.24",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.24",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4t64",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "8.5.0-2ubuntu10.9",
      "fix": "libcurl4t64 8.5.0-2ubuntu10.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libcurl4t64-8.5.0-2ubuntu10.9",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4t64",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "8.14.1-2ubuntu1.3",
      "fix": "libcurl4t64 8.14.1-2ubuntu1.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libcurl4t64-8.14.1-2ubuntu1.3",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "libcurl4t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "8.18.0-1ubuntu2.1",
      "fix": "libcurl4t64 8.18.0-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libcurl4t64-8.18.0-1ubuntu2.1",
      "released": "2026-04-29T07:00:00Z"
    }
  ],
  "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"
  }
}