{
  "cveId": "CVE-2026-85534",
  "url": "https://patchblox.com/security/cve/CVE-2026-85534",
  "summary": "CVE-2026-85534 is fixed in 10 products on 1 platform, first by gir1.2-soup-3.0 3.0.7-0ubuntu1\u002Besm9, released September 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initial_window_size shrinks during deferred body read",
  "description": "A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.",
  "published": "2026-09-04T04:17:00Z",
  "severity": "Moderate",
  "cvss": 5.9,
  "cwe": "Reachable Assertion",
  "epss": 0.00315,
  "epssPercentile": 0.24622,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85534",
  "fixes": [
    {
      "platform": "linux",
      "product": "gir1.2-soup-3.0",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.0.7-0ubuntu1\u002Besm9",
      "fix": "gir1.2-soup-3.0 3.0.7-0ubuntu1\u002Besm9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-gir1.2-soup-3.0-3.0.7-0ubuntu1-esm9",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "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": "opensuse-leap 16.0",
      "fixedVersion": "3.6.6-160000.4.1",
      "fix": "OPENSUSE-SU-2026:21901-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21901-1",
      "released": "2026-09-21T12:40:20Z"
    },
    {
      "platform": "linux",
      "product": "libsoup",
      "release": "sles 15.6",
      "fixedVersion": "3.4.4-150600.3.53.1",
      "fix": "SUSE-SU-2026:4273-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4273-1",
      "released": "2026-09-21T07:30:37Z"
    },
    {
      "platform": "linux",
      "product": "libsoup",
      "release": "sles 15.7",
      "fixedVersion": "3.4.4-150600.3.53.1",
      "fix": "SUSE-SU-2026:4273-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4273-1",
      "released": "2026-09-21T07:30:37Z"
    },
    {
      "platform": "linux",
      "product": "libsoup",
      "release": "sles 16.0",
      "fixedVersion": "3.6.6-160000.4.1",
      "fix": "SUSE-SU-2026:23866-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23866-1",
      "released": "2026-09-21T12:40:18Z"
    },
    {
      "platform": "linux",
      "product": "libsoup-3.0-0",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.0.7-0ubuntu1\u002Besm9",
      "fix": "libsoup-3.0-0 3.0.7-0ubuntu1\u002Besm9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libsoup-3.0-0-3.0.7-0ubuntu1-esm9",
      "released": "2026-09-04T04:17:00Z"
    },
    {
      "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 22.04.1 LTS (jammy)",
      "fixedVersion": "3.0.7-0ubuntu1\u002Besm9",
      "fix": "libsoup-3.0-common 3.0.7-0ubuntu1\u002Besm9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libsoup-3.0-common-3.0.7-0ubuntu1-esm9",
      "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 22.04.1 LTS (jammy)",
      "fixedVersion": "3.0.7-0ubuntu1\u002Besm9",
      "fix": "libsoup-3.0-tests 3.0.7-0ubuntu1\u002Besm9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libsoup-3.0-tests-3.0.7-0ubuntu1-esm9",
      "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": "amzn 2023",
      "fixedVersion": "3.7.2-1.amzn2023",
      "fix": "ALAS2023-2026-3144",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3144",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "3.7.2-1.amzn2023",
      "fix": "ALAS2023-2026-3144",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3144",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "3.7.2-1.amzn2023",
      "fix": "ALAS2023-2026-3144",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3144",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-devel",
      "release": "amzn 2023",
      "fixedVersion": "3.7.2-1.amzn2023",
      "fix": "ALAS2023-2026-3144",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3144",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsoup3-doc",
      "release": "amzn 2023",
      "fixedVersion": "3.7.2-1.amzn2023",
      "fix": "ALAS2023-2026-3144",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3144",
      "released": "2026-09-28T09:00:00Z"
    }
  ],
  "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"
  }
}