CVE-2026-73561
Hub: Unauthenticated WebSocket RPC Waiter Resource Exhaustion
Description
Hub is a Node.js WebSocket server and client with added features. Prior to 0.2.16, every incoming unauthenticated WebSocket connection triggers loadDefaultConnectionEventListeners to call requestClientId, which calls rpc.send for the get-client-id action and pushes a request into RPC.requests. The RPC.waitForReply function starts a setInterval polling loop every 10 milliseconds that is cleared only after a matching reply; if the client remains silent and closes, the timer and pending request stay allocated because the socket close path does not cancel them. Repeated connections therefore cause unbounded timers and heap entries, exhausting CPU and memory and making the server unavailable. This issue is fixed in version 0.2.16.
INFO
Published Date :
Aug. 13, 2026, 6:18 p.m.
Last Modified :
Oct. 24, 2026, 3:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Hub to version 0.2.16 or later.
- Monitor server resources after update.
- Ensure proper socket closure handling.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-73561.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-73561 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-73561
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-73561 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-73561 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Changed Translation Title: hub de anephenix, Description: Hub es un servidor y cliente WebSocket de Node.js con características añadidas. Antes de la versión 0.2.16, cada conexión WebSocket entrante no autenticada desencadena loadDefaultConnectionEventListeners para llamar a requestClientId, que llama a rpc.send para la acción get-client-id y empuja una solicitud a RPC.requests. La función RPC.waitForReply inicia un bucle de sondeo setInterval cada 10 milisegundos que se borra solo después de una respuesta coincidente; si el cliente permanece en silencio y se cierra, el temporizador y la solicitud pendiente permanecen asignados porque la ruta de cierre del socket no los cancela. Las conexiones repetidas, por lo tanto, causan temporizadores ilimitados y entradas de pila, agotando la CPU y la memoria y haciendo que el servidor no esté disponible. Este problema está solucionado en la versión 0.2.16. Title: hub de anephenix, Description: Hub es un servidor y cliente WebSocket de Node.js con características añadidas. Antes de la versión 0.2.16, cada conexión WebSocket entrante no autenticada desencadena loadDefaultConnectionEventListeners para llamar a requestClientId, que llama a rpc.send para la acción get-client-id y empuja una solicitud a RPC.requests. La función RPC.waitForReply inicia un bucle de sondeo setInterval cada 10 milisegundos que se borra solo después de una respuesta coincidente; si el cliente permanece en silencio y se cierra, el temporizador y la solicitud pendiente permanecen asignados porque la ruta de cierre del socket no los cancela. Las conexiones repetidas, por lo tanto, causan temporizadores ilimitados y entradas de pila, agotando la CPU y la memoria y haciendo que el servidor no esté disponible. Este problema está solucionado en la versión 0.2.16. -
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: hub de anephenix, Description: Hub es un servidor y cliente WebSocket de Node.js con características añadidas. Antes de la versión 0.2.16, cada conexión WebSocket entrante no autenticada desencadena loadDefaultConnectionEventListeners para llamar a requestClientId, que llama a rpc.send para la acción get-client-id y empuja una solicitud a RPC.requests. La función RPC.waitForReply inicia un bucle de sondeo setInterval cada 10 milisegundos que se borra solo después de una respuesta coincidente; si el cliente permanece en silencio y se cierra, el temporizador y la solicitud pendiente permanecen asignados porque la ruta de cierre del socket no los cancela. Las conexiones repetidas, por lo tanto, causan temporizadores ilimitados y entradas de pila, agotando la CPU y la memoria y haciendo que el servidor no esté disponible. Este problema está solucionado en la versión 0.2.16. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 18, 2026
Action Type Old Value New Value Added Reference https://github.com/anephenix/hub/security/advisories/GHSA-g5vv-q72c-7j78 Added SSVC {'id': 'CVE-2026-73561', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-18T01:26:22.551405Z'} -
New CVE Received by [email protected]
Aug. 13, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'anephenix', 'product': 'hub', 'versions': [{'status': 'affected', 'version': '< 0.2.16'}]}] Added Description Hub is a Node.js WebSocket server and client with added features. Prior to 0.2.16, every incoming unauthenticated WebSocket connection triggers loadDefaultConnectionEventListeners to call requestClientId, which calls rpc.send for the get-client-id action and pushes a request into RPC.requests. The RPC.waitForReply function starts a setInterval polling loop every 10 milliseconds that is cleared only after a matching reply; if the client remains silent and closes, the timer and pending request stay allocated because the socket close path does not cancel them. Repeated connections therefore cause unbounded timers and heap entries, exhausting CPU and memory and making the server unavailable. This issue is fixed in version 0.2.16. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added Reference https://github.com/anephenix/hub/commit/931576db3cdbf4f1583bd2c3c8759c4f4e032ab3 Added Reference https://github.com/anephenix/hub/security/advisories/GHSA-g5vv-q72c-7j78 Added Reference https://github.com/anephenix/hub/tree/v0.2.16