{
  "cveId": "CVE-2026-4271",
  "url": "https://patchblox.com/security/cve/CVE-2026-4271",
  "summary": "CVE-2026-4271 is fixed in 8 products on 1 platform, first by RHSA-2026:17482, released March 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libsoup3: A flaw was found in libsoup, a library for handling HTTP requests",
  "description": "A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).",
  "published": "2026-03-16T00:00:00Z",
  "severity": "moderate",
  "cvss": 5.9,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
  "epss": 0.0088,
  "epssPercentile": 0.59342,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "gir1.2-soup-3.0",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.4.4-5ubuntu0.9",
      "fix": "gir1.2-soup-3.0 3.4.4-5ubuntu0.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-gir1.2-soup-3.0-3.4.4-5ubuntu0.9",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "platform": "linux",
      "product": "gir1.2-soup-3.0",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.6.6-1ubuntu0.1",
      "fix": "gir1.2-soup-3.0 3.6.6-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-gir1.2-soup-3.0-3.6.6-1ubuntu0.1",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup",
      "release": "sles 15.6",
      "fixedVersion": "3.4.4-150600.3.47.1",
      "fix": "SUSE-SU-2026:2314-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2314-1",
      "released": "2026-06-09T12:51:31Z"
    },
    {
      "platform": "linux",
      "product": "libsoup",
      "release": "sles 15.7",
      "fixedVersion": "3.4.4-150600.3.47.1",
      "fix": "SUSE-SU-2026:2314-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2314-1",
      "released": "2026-06-09T12:51:31Z"
    },
    {
      "platform": "linux",
      "product": "libsoup",
      "release": "sles 16.0",
      "fixedVersion": "3.6.6-160000.2.1",
      "fix": "SUSE-SU-2026:21998-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-21998-1",
      "released": "2026-05-29T13:40:44Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-3.0-0",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.4.4-5ubuntu0.9",
      "fix": "libsoup-3.0-0 3.4.4-5ubuntu0.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libsoup-3.0-0-3.4.4-5ubuntu0.9",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-3.0-0",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.6.6-1ubuntu0.1",
      "fix": "libsoup-3.0-0 3.6.6-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libsoup-3.0-0-3.6.6-1ubuntu0.1",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-3.0-common",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.4.4-5ubuntu0.9",
      "fix": "libsoup-3.0-common 3.4.4-5ubuntu0.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libsoup-3.0-common-3.4.4-5ubuntu0.9",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-3.0-common",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.6.6-1ubuntu0.1",
      "fix": "libsoup-3.0-common 3.6.6-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libsoup-3.0-common-3.6.6-1ubuntu0.1",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-3.0-tests",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.4.4-5ubuntu0.9",
      "fix": "libsoup-3.0-tests 3.4.4-5ubuntu0.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libsoup-3.0-tests-3.4.4-5ubuntu0.9",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-3.0-tests",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.6.6-1ubuntu0.1",
      "fix": "libsoup-3.0-tests 3.6.6-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libsoup-3.0-tests-3.6.6-1ubuntu0.1",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3",
      "release": "RHEL 10",
      "fixedVersion": "3.6.5-3.el10_0.15",
      "fix": "RHSA-2026:17482",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-17482",
      "released": "2026-03-30T05:30:32Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3",
      "release": "almalinux 10",
      "fixedVersion": "3.6.5-3.el10_2.11",
      "fix": "ALSA-2026:19143",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-19143",
      "released": "2026-05-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3",
      "release": "ol 10",
      "fixedVersion": "0:3.6.5-3.el10_1.11",
      "fix": "ELSA-2026-15968",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-15968",
      "released": "2026-05-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3",
      "release": "rocky 10",
      "fixedVersion": "0:3.6.5-3.el10_1.11",
      "fix": "RLSA-2026:15968",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-15968",
      "released": "2026-05-13T12:06:54Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-devel",
      "release": "almalinux 10",
      "fixedVersion": "3.6.5-3.el10_2.11",
      "fix": "ALSA-2026:19143",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-19143",
      "released": "2026-05-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-devel",
      "release": "ol 10",
      "fixedVersion": "0:3.6.5-3.el10_1.11",
      "fix": "ELSA-2026-15968",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-15968",
      "released": "2026-05-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-doc",
      "release": "almalinux 10",
      "fixedVersion": "3.6.5-3.el10_2.11",
      "fix": "ALSA-2026:19143",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-19143",
      "released": "2026-05-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-doc",
      "release": "ol 10",
      "fixedVersion": "0:3.6.5-3.el10_1.11",
      "fix": "ELSA-2026-15968",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-15968",
      "released": "2026-05-11T00:00:00Z"
    }
  ],
  "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"
  }
}