Vulnerability · Published Jul 28, 2026 · Assigned by GitHub_M

CVE-2026-54609QTINeon has unauthenticated relay-to-host amplification via unbounded RECONNECT_REQUEST forwarding

High 8.6

In plain English

A high-severity uncontrolled resource consumption in QTINeon from Quiet-Terminal-Interactive. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)0.5%top 59.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	com.quietterminal:qti-neon	no fix listed	GHSA-85rg-p3fr-xc2f
PyPI	qti-neon	no fix listed	GHSA-85rg-p3fr-xc2f
PyPI	qti-neon	no fix listed	PYSEC-2026-3615
npm	qti-neon	no fix listed	GHSA-85rg-p3fr-xc2f

Affected products (as reported)

Vendor	Product	Versions
Quiet-Terminal-Interactive	QTINeon	1.0.0

Weakness: CWE-400, CWE-406, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References

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