{
  "cveId": "CVE-2026-42304",
  "url": "https://patchblox.com/security/cve/CVE-2026-42304",
  "summary": "CVE-2026-42304 is fixed in 4 products on 1 platform, first by python3-twisted 22.1.0-2ubuntu2.7, released May 13, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Twisted: Denial of Service (DoS) in twisted.names via Crafted DNS Compression Pointer Chains",
  "description": "Twisted is an event-based framework for internet applications, supporting Python 3.6\u002B. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server. This vulnerability is fixed in 26.4.0rc2.",
  "published": "2026-05-13T14:16:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Uncontrolled Resource Consumption",
  "epss": 0.00433,
  "epssPercentile": 0.37852,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42304",
  "fixes": [
    {
      "platform": "linux",
      "product": "python-Twisted",
      "release": "sles 16.0",
      "fixedVersion": "24.10.0-160000.3.1",
      "fix": "SUSE-SU-2026:22004-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22004-1",
      "released": "2026-06-01T08:24:17Z"
    },
    {
      "platform": "linux",
      "product": "python3-twisted",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "22.1.0-2ubuntu2.7",
      "fix": "python3-twisted 22.1.0-2ubuntu2.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-python3-twisted-22.1.0-2ubuntu2.7",
      "released": "2026-05-13T14:16:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-twisted",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "24.3.0-1ubuntu0.2",
      "fix": "python3-twisted 24.3.0-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-twisted-24.3.0-1ubuntu0.2",
      "released": "2026-05-13T14:16:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-twisted",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "24.11.0-1ubuntu0.1",
      "fix": "python3-twisted 24.11.0-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-python3-twisted-24.11.0-1ubuntu0.1",
      "released": "2026-05-13T14:16:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-twisted",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "25.5.0-5ubuntu0.1",
      "fix": "python3-twisted 25.5.0-5ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-python3-twisted-25.5.0-5ubuntu0.1",
      "released": "2026-05-13T14:16:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-twisted",
      "release": "amzn 2023",
      "fixedVersion": "22.4.0-129.amzn2023.0.6",
      "fix": "ALAS2023-2026-1734",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1734",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-twisted\u002Btls",
      "release": "amzn 2023",
      "fixedVersion": "22.4.0-129.amzn2023.0.6",
      "fix": "ALAS2023-2026-1734",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1734",
      "released": "2026-05-25T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "twisted",
      "release": "Debian 14",
      "fixedVersion": "26.4.0-1",
      "fix": "DEBIAN-CVE-2026-42304",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42304",
      "released": "2026-05-13T21:16:46Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}