Vulnerability-Lookup

CVE-2026-73565 (GCVE-0-2026-73565)

Vulnerability from cvelistv5 – Published: 2026-08-13 17:37 – Updated: 2026-08-14 16:45

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.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 16:45 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/honojs/node-server/security/ad…	x_refsource_CONFIRM
https://github.com/honojs/node-server/commit/3a21…	x_refsource_MISC
https://github.com/honojs/node-server/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
honojs	node-server	Affected: >= 2.0.0, < 2.0.10	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-73565",
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FKIE_CVE-2026-73565

Vulnerability from fkie_nvd - Published: 2026-08-13 18:18 - Updated: 2026-09-10 20:30

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1
	security-advisories@github.com	https://github.com/honojs/node-server/releases/tag/v2.0.10
	security-advisories@github.com	https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "node-server",
          "vendor": "honojs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.0.10"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "@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\u0027s 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."
    }
  ],
  "id": "CVE-2026-73565",
  "lastModified": "2026-09-10T20:30:11.423",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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          "timestamp": "2026-08-14T16:45:01.113756Z",
          "version": "2.0.3"
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      }
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  },
  "published": "2026-08-13T18:18:19.103",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1"
    },
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      "url": "https://github.com/honojs/node-server/releases/tag/v2.0.10"
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GHSA-9MQV-5HH9-4CGG

Vulnerability from github – Published: 2026-07-21 22:04 – Updated: 2026-08-13 17:37

Summary

Node.js Adapter for Hono: Unauthenticated memory-leak DoS via aborted WebSocket handshake

Details

Summary

A WebSocket upgrade request to an upgradeWebSocket route with a missing or malformed Sec-WebSocket-Key header leaks memory permanently. The request's IncomingMessage is retained in an internal map and a pending promise is never settled, even though no connection is established. Since the route is reachable pre-handshake without authentication, an unauthenticated attacker can flood it to gradually exhaust memory.

Details

The built-in WebSocket helper cleans up its internal map only on a successful handshake or when the route guard rejects the request. When ws aborts the handshake because Sec-WebSocket-Key is missing or malformed, no connection event is emitted, so neither cleanup path runs and the entry is retained forever. A present-but-malformed key leaks identically, so a proxy that only checks for the header's presence does not mitigate it.

Impact

An unauthenticated attacker can flood any public upgradeWebSocket route with malformed-key upgrade requests, causing unbounded memory growth and eventual loss of availability. No confidentiality or integrity impact.

Reported by @TarPeg007.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.0.9"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@hono/node-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-73565"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T22:04:27Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nA WebSocket upgrade request to an `upgradeWebSocket` route with a missing or malformed `Sec-WebSocket-Key` header leaks memory permanently. The request\u0027s `IncomingMessage` is retained in an internal map and a pending promise is never settled, even though no connection is established. Since the route is reachable pre-handshake without authentication, an unauthenticated attacker can flood it to gradually exhaust memory.\n\n## Details\n\nThe built-in WebSocket helper cleans up its internal map only on a successful handshake or when the route guard rejects the request. When `ws` aborts the handshake because `Sec-WebSocket-Key` is missing or malformed, no `connection` event is emitted, so neither cleanup path runs and the entry is retained forever. A present-but-malformed key leaks identically, so a proxy that only checks for the header\u0027s presence does not mitigate it.\n\n## Impact\n\nAn unauthenticated attacker can flood any public `upgradeWebSocket` route with malformed-key upgrade requests, causing unbounded memory growth and eventual loss of availability. No confidentiality or integrity impact.\n\nReported by @TarPeg007.",
  "id": "GHSA-9mqv-5hh9-4cgg",
  "modified": "2026-08-13T17:37:34Z",
  "published": "2026-07-21T22:04:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/honojs/node-server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/node-server/releases/tag/v2.0.10"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Node.js Adapter for Hono: Unauthenticated memory-leak DoS via aborted WebSocket handshake"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-73565 (GCVE-0-2026-73565)

FKIE_CVE-2026-73565

GHSA-9MQV-5HH9-4CGG

Summary

Details

Impact

Tags

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Nomenclature

Related by attack behaviour