CVE-2026-93567

{
  "etk_id": "ETK-2026-193",
  "cve_id": "CVE-2026-93567",
  "display_id": "CVE-2026-93567",
  "ghsa_id": "GHSA-45h4-vhwh-fmhg",
  "euvd_id": "EUVD-2026-82943",
  "status": "published",
  "anchor_state": "anchored",
  "title": "CONNECT authority confusion in Netty HTTP/2 codec",
  "summary": "Netty's netty-codec-http2 can map an HTTP/1 CONNECT request to the wrong HTTP/2 tunnel authority during protocol conversion. A remote client may bypass destination-based tunnel or egress controls when an HTTP/1-to-HTTP/2 proxy or gateway accepts CONNECT requests and authorizes the original request target.",
  "mitigation": "Upgrade io.netty:netty-codec-http2 to 4.1.138.Final or 4.2.18.Final, as appropriate. Until then, block CONNECT requests that cross an HTTP/1-to-HTTP/2 conversion boundary.",
  "vendor": "maven",
  "product": "maven:io.netty:netty-codec-http2",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.1.0.Final, <= 4.1.137.Final"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "4.1.138.Final"
      ],
      "package_name": "io.netty:netty-codec-http2",
      "purl": "pkg:maven/io.netty/netty-codec-http2"
    },
    {
      "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-http2",
      "purl": "pkg:maven/io.netty/netty-codec-http2"
    }
  ],
  "cwes": [
    20
  ],
  "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:H/A:N",
  "epss_score": 0.0256,
  "epss_percentile": 0.8488,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 18.672742533333334,
  "t0_at": "2026-09-18T14:23:27.219000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-01T02:43:54.095719+00:00",
      "days": 12.514199962025463,
      "is_lower_bound": false,
      "measured_at": "2026-09-18T14:23:27.219000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-09-18T14:23:27.219000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-18T14:23:27.219000+00:00",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-45h4-vhwh-fmhg"
    }
  }
}