@hono/node-server: Unauthenticated memory-leak DoS via aborted WebSocket handshake

{
  "id": "758410c30f433cfbea2089c8326f871bc13116258941b02e3bfcf6955be2943a",
  "url": "https://osv.dev/vulnerability/CVE-2026-73565",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "@hono/node-server: Unauthenticated memory-leak DoS via aborted WebSocket handshake",
    "summary": "@hono/node-server allows running the Hono application on Node.js. From 2.0.0 until 2.0.10, a WebSocket upgrade request to an upgradeWebSocket route with a missing or malformed Sec-WebSocket-Key header causes src/websocket.ts to retain the request's IncomingMessage in waiterMap and leave waitForWebSocket pending because ws.handleUpgrade emits no connection event. The aborted handshake therefore has no cleanup path, allowing an unauthenticated attacker to flood a public route, cause unbounded memory growth, and eventually make the service unavailable. This issue is fixed in version 2.0.10.",
    "evidence": "osv:CVE-2026-73565",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-73565",
      "aliases": [
        "CVE-2026-73565",
        "GHSA-9mqv-5hh9-4cgg"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/honojs/node-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "58c9355998b3b202bf7eb22b1505a2d4d847c3b0"
                },
                {
                  "fixed": "7c1457ed5536c02fdd2f001129fae67bcbca54a1"
                },
                {
                  "fixed": "3a21938c418340e980cb7ffa88e78369f78392d1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "fixed": "2.0.10"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3a21938c418340e980cb7ffa88e78369f78392d1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7c1457ed5536c02fdd2f001129fae67bcbca54a1"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.0.10"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.0.9",
            "v2.0.8",
            "v2.0.7",
            "v2.0.6",
            "v2.0.5",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73565.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:20.906712111Z",
      "provider": "osv",
      "references": [
        "https://github.com/honojs/node-server/releases/tag/v2.0.10",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73565.json",
        "https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73565",
        "https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-401",
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73565.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73565",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487300,
  "published_at": "2026-08-13T17:37:28.579+00:00"
}