CVE-2026-100661

{
  "etk_id": "ETK-2026-75",
  "cve_id": "CVE-2026-100661",
  "display_id": "CVE-2026-100661",
  "ghsa_id": "GHSA-7m86-g9j9-26xf",
  "euvd_id": "EUVD-2026-87755",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unbounded QPACK integer decoding in Netty HTTP/3 codec",
  "summary": "Netty's io.netty:netty-codec-http3 before 4.2.18.Final can mishandle overlong QPACK prefixed integers. A remote unauthenticated peer that can establish an HTTP/3 connection can cause unbounded memory use and excessive event-loop CPU consumption, resulting in denial of service.",
  "mitigation": "Upgrade io.netty:netty-codec-http3 to 4.2.18.Final or later. Restrict exposure to untrusted HTTP/3 connections until the upgrade is deployed.",
  "vendor": "maven",
  "product": "maven:io.netty:netty-codec-http3",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.2.0.Final, <= 4.2.17.Final"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "4.2.18.Final"
      ],
      "package_name": "io.netty:netty-codec-http3",
      "purl": "pkg:maven/io.netty/netty-codec-http3"
    }
  ],
  "cwes": [
    400
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": 0.0034,
  "epss_percentile": 0.2643,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 32.03531405,
  "t0_at": "2026-09-26T13:23:28.303000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-09-26T13:23:28.303000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-26T13:23:28.303000+00:00",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-v5p2-hmgx-3xrx"
    }
  }
}