EUVD-2026-58180Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Network-reachable pre-auth route, no complexity or interaction; availability only, limited per-request impact requires sustained flood.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
3Blast Radius
ecosystem impact- 7 npm packages depend on @hono/node-server (6 direct, 1 indirect)
Ecosystem-wide dependent count for version 2.0.0.
DescriptionCVE.org
@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.
AnalysisAI
Unbounded memory growth in @hono/node-server 2.0.0-2.0.9 allows unauthenticated remote attackers to exhaust server memory and cause denial of service by flooding any public WebSocket upgrade route with requests bearing a missing or malformed Sec-WebSocket-Key header. The root cause is a missing cleanup path in src/websocket.ts: when ws.handleUpgrade rejects the handshake, no connection event fires, leaving the IncomingMessage permanently retained in waiterMap and the waitForWebSocket promise perpetually pending. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable code path is reached only when all of the following are true: (1) the application uses @hono/node-server version 2.0.0-2.0.9; (2) at least one route is defined with the upgradeWebSocket helper; and (3) that route is reachable without prior authentication middleware rejecting the request. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L scores 5.3 (Medium), reflecting that exploitation is trivially accessible from the network with no authentication and no complexity, but the availability impact is rated Low rather than High - consistent with the attack requiring sustained flooding to exhaust memory rather than causing immediate service failure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker targeting a Node.js service using @hono/node-server 2.0.0-2.0.9 with a public WebSocket endpoint repeatedly sends HTTP upgrade requests containing a syntactically invalid Sec-WebSocket-Key value (e.g., a string that does not base64-decode to 16 bytes). Each request causes the server to retain an IncomingMessage object and a pending Promise in memory with no cleanup; at sufficient request rates, heap memory grows unboundedly until the Node.js process is killed by the OS OOM killer or crashes, denying service to all clients. … |
| Remediation | The primary remediation is to upgrade @hono/node-server to version 2.0.10 or later, which introduces a reject path and a socket close listener that reliably clean up waiterMap entries for aborted handshakes (commit 3a21938c). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-401 – Memory Leak
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