websocket-driver: Denial of service via malformed Host header

{
  "id": "3e7de872553a37ccd0e897ca1fffb8544cd8cde4fc82d090e1221e3126aaa4a1",
  "url": "https://osv.dev/vulnerability/CVE-2026-61666",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "websocket-driver: Denial of service via malformed Host header",
    "summary": "websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.2, WebSocket::Driver.server() passes a malformed Host header to URI.parse in lib/websocket/http/request.rb without catching URI::InvalidURIError, allowing a remote client to crash a TCP-backed WebSocket server when the application does not catch the error from parse(). This issue is fixed in version 0.8.2.",
    "evidence": "osv:CVE-2026-61666",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-61666",
      "aliases": [
        "CVE-2026-61666",
        "GHSA-2x63-gw47-w4mm"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/faye/websocket-driver-ruby",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "49e230b252817632c1ab14a8c501fa460d5fa9bf"
                },
                {
                  "fixed": "7d6fd87759a2fdc83590d3b49ffa661dc53fa128"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.8.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7d6fd87759a2fdc83590d3b49ffa661dc53fa128"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.8.1",
            "0.8.0",
            "0.7.7",
            "0.7.6",
            "0.7.5",
            "0.7.4",
            "0.7.3",
            "0.7.2",
            "0.7.1",
            "0.7.0",
            "0.6.5",
            "0.6.4",
            "0.6.3",
            "0.6.2",
            "0.6.1",
            "0.6.0",
            "0.5.4",
            "0.5.3",
            "0.5.2",
            "0.5.1",
            "0.5.0",
            "0.4.0",
            "0.3.5",
            "0.3.4",
            "0.3.3",
            "0.3.2",
            "0.3.1",
            "0.3.0",
            "0.2.3",
            "0.2.2",
            "0.2.1",
            "0.2.0",
            "0.1.0",
            "0.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61666.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.664935959Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61666.json",
        "https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-2x63-gw47-w4mm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-61666",
        "https://github.com/faye/websocket-driver-ruby/commit/7d6fd87759a2fdc83590d3b49ffa661dc53fa128"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61666.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-61666",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492494,
  "published_at": "2026-08-17T16:16:33.374+00:00"
}