{
  "cveId": "CVE-2026-110354",
  "url": "https://patchblox.com/security/cve/CVE-2026-110354",
  "summary": "CVE-2026-110354 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-110354, released October 27, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.",
  "description": "HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.",
  "published": "2026-10-21T20:16:00Z",
  "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": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
  "epss": 0.00807,
  "epssPercentile": 0.57079,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-110354",
  "fixes": [
    {
      "platform": "linux",
      "product": "haproxy",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.6.12-1\u002Bdeb12u4",
      "fix": "DEBIAN-CVE-2026-110354",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-110354",
      "released": "2026-10-27T21:14:52Z"
    },
    {
      "platform": "linux",
      "product": "haproxy",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "3.0.11-1\u002Bdeb13u4",
      "fix": "DEBIAN-CVE-2026-110354",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-110354",
      "released": "2026-10-27T21:14:52Z"
    },
    {
      "platform": "linux",
      "product": "haproxy",
      "release": "Debian 14",
      "fixedVersion": "3.2.26-1",
      "fix": "DEBIAN-CVE-2026-110354",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-110354",
      "released": "2026-10-27T21:14:52Z"
    },
    {
      "platform": "linux",
      "product": "haproxy",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.4.30-0ubuntu0.22.04.3",
      "fix": "haproxy 2.4.30-0ubuntu0.22.04.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-haproxy-2.4.30-0ubuntu0.22.04.3",
      "released": "2026-11-04T19:14:56Z"
    },
    {
      "platform": "linux",
      "product": "haproxy",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "2.8.30-0ubuntu0.24.04.2",
      "fix": "haproxy 2.8.30-0ubuntu0.24.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-haproxy-2.8.30-0ubuntu0.24.04.2",
      "released": "2026-11-04T19:14:59Z"
    },
    {
      "platform": "linux",
      "product": "haproxy",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.2.25-0ubuntu0.26.04.2",
      "fix": "haproxy 3.2.25-0ubuntu0.26.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-haproxy-3.2.25-0ubuntu0.26.04.2",
      "released": "2026-11-07T00:38:05Z"
    },
    {
      "platform": "linux",
      "product": "vim-haproxy",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.4.30-0ubuntu0.22.04.3",
      "fix": "vim-haproxy 2.4.30-0ubuntu0.22.04.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-vim-haproxy-2.4.30-0ubuntu0.22.04.3",
      "released": "2026-11-04T19:14:56Z"
    },
    {
      "platform": "linux",
      "product": "vim-haproxy",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "2.8.30-0ubuntu0.24.04.2",
      "fix": "vim-haproxy 2.8.30-0ubuntu0.24.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-vim-haproxy-2.8.30-0ubuntu0.24.04.2",
      "released": "2026-11-04T19:14:59Z"
    },
    {
      "platform": "linux",
      "product": "vim-haproxy",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.2.25-0ubuntu0.26.04.2",
      "fix": "vim-haproxy 3.2.25-0ubuntu0.26.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-vim-haproxy-3.2.25-0ubuntu0.26.04.2",
      "released": "2026-11-07T00:38:05Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}