CVE-2026-54609

QTINeon has unauthenticated relay-to-host amplification via unbounded RECONNECT_REQUEST forwarding

State: Published
Severity: 8.6 High
Published: Jul 28, 2026
Updated: Jul 28, 2026
Reserved: Jun 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-406 Insufficient Control of Network Message Volume (Network Amplification)
CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
QTINeonQuiet-Terminal-Interactive	1.0.0Affected

References

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

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