CVE-2026-18660

{
  "etk_id": "ETK-2026-2023",
  "cve_id": "CVE-2026-18660",
  "display_id": "CVE-2026-18660",
  "ghsa_id": "GHSA-7wfj-j486-mxrf",
  "euvd_id": "EUVD-2026-101987",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Case-sensitive hostname blacklist bypass in Jetty proxies",
  "summary": "Jetty jetty-server and jetty-proxy host restrictions can treat case variants of the same DNS hostname as different destinations. An attacker able to use a forward proxy or CONNECT handler configured with blacklist-only destination controls may reach a blocked HTTP service or TCP endpoint.",
  "mitigation": "Upgrade jetty-server to 12.1.12 or 12.0.39, and jetty-proxy to 11.0.33, 10.0.33, or 9.4.65, as applicable. Until upgraded, use strict allowlists and enforce proxy authentication and network egress controls.",
  "vendor": "maven",
  "product": "maven:org.eclipse.jetty:jetty-server",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=12.1.0, <=12.1.11"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "12.1.12"
      ],
      "package_name": "org.eclipse.jetty:jetty-server",
      "purl": "pkg:maven/org.eclipse.jetty/jetty-server"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=12.0.0, <=12.0.38"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "12.0.39"
      ],
      "package_name": "org.eclipse.jetty:jetty-server",
      "purl": "pkg:maven/org.eclipse.jetty/jetty-server"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=11.0.0, <=11.0.32"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "11.0.33"
      ],
      "package_name": "org.eclipse.jetty:jetty-proxy",
      "purl": "pkg:maven/org.eclipse.jetty/jetty-proxy"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=10.0.0, <=10.0.32"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "10.0.33"
      ],
      "package_name": "org.eclipse.jetty:jetty-proxy",
      "purl": "pkg:maven/org.eclipse.jetty/jetty-proxy"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=9.0.0, <=9.4.64"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "9.4.65"
      ],
      "package_name": "org.eclipse.jetty:jetty-proxy",
      "purl": "pkg:maven/org.eclipse.jetty/jetty-proxy"
    }
  ],
  "cwes": [
    178
  ],
  "cvss_score": 8.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
  "epss_score": 0.0032,
  "epss_percentile": 0.2295,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 23.267290733333333,
  "t0_at": "2026-10-15T09:38:02.125000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-18T23:32:36.381138+00:00",
      "days": 3.5795631497453706,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T09:38:02.125000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-15T09:38:02.125000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T09:38:02.125000+00:00",
      "url": "https://github.com/jetty/jetty.project/security/advisories/GHSA-7wfj-j486-mxrf"
    }
  }
}