{
  "cveId": "CVE-2025-43859",
  "url": "https://patchblox.com/security/cve/CVE-2025-43859",
  "summary": "CVE-2025-43859 is fixed in 2 products on 1 platform, first by python3-h11 0.14.0-1ubuntu0.24.04.1, released April 24, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "python3-h11: h11 is a Python implementation of HTTP/1.1",
  "description": "h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, aleniency in h11\u0027s parsing of line terminators in chunked-coding messagebodies can lead to request smuggling vulnerabilities under certainconditions. This issue has been patched in version 0.16.0. Sinceexploitation requires the combination of buggy h11 with a buggy (reverse)proxy, fixing either component is sufficient to mitigate this issue.",
  "published": "2025-04-24T12:15:00Z",
  "severity": "Medium",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00594,
  "epssPercentile": 0.48645,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "python-h11",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "0.14.0-1.1~deb12u1",
      "fix": "DEBIAN-CVE-2025-43859",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-43859",
      "released": "2025-04-24T19:15:47Z"
    },
    {
      "platform": "linux",
      "product": "python-h11",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "0.14.0-1.1",
      "fix": "DEBIAN-CVE-2025-43859",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-43859",
      "released": "2025-04-24T19:15:47Z"
    },
    {
      "platform": "linux",
      "product": "python-h11",
      "release": "Debian 14",
      "fixedVersion": "0.14.0-1.1",
      "fix": "DEBIAN-CVE-2025-43859",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-43859",
      "released": "2025-04-24T19:15:47Z"
    },
    {
      "platform": "linux",
      "product": "python-h11",
      "release": "opensuse-leap 15.6",
      "fixedVersion": "0.14.0-150400.9.6.1",
      "fix": "SUSE-SU-2025:1430-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-1430-1",
      "released": "2025-05-02T08:10:35Z"
    },
    {
      "platform": "linux",
      "product": "python-h11",
      "release": "sles 15.6",
      "fixedVersion": "0.14.0-150400.9.6.1",
      "fix": "SUSE-SU-2025:1430-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-1430-1",
      "released": "2025-05-02T08:10:35Z"
    },
    {
      "platform": "linux",
      "product": "python3-h11",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "0.14.0-1ubuntu0.24.04.1",
      "fix": "python3-h11 0.14.0-1ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-h11-0.14.0-1ubuntu0.24.04.1",
      "released": "2025-04-24T12:15:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-h11",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "0.14.0-1ubuntu0.24.10.1",
      "fix": "python3-h11 0.14.0-1ubuntu0.24.10.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-python3-h11-0.14.0-1ubuntu0.24.10.1",
      "released": "2026-01-16T01:42:24Z"
    },
    {
      "platform": "linux",
      "product": "python3-h11",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "0.14.0-1ubuntu0.25.04.1",
      "fix": "python3-h11 0.14.0-1ubuntu0.25.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-python3-h11-0.14.0-1ubuntu0.25.04.1",
      "released": "2026-01-16T01:42:25Z"
    }
  ],
  "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"
  }
}