{"id":"CVE-2026-54609","aliases":["GHSA-85rg-p3fr-xc2f","PYSEC-2026-3615"],"url":"https://o3.security/vulnerability/CVE-2026-54609","summary":"QTINeon has unauthenticated relay-to-host amplification via unbounded RECONNECT_REQUEST forwarding","details":"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.","published":"2026-07-28T16:36:37.938Z","modified":"2026-08-12T03:51:40.576535784Z","cvss":{"score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"},"epss":{"score":0.00263,"percentile":0.18037,"asOf":"2026-09-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"com.quietterminal:qti-neon","fixedVersion":null},{"ecosystem":"npm","name":"qti-neon","fixedVersion":null},{"ecosystem":"PyPI","name":"qti-neon","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54609.json"},{"type":"ADVISORY","url":"https://github.com/Quiet-Terminal-Interactive/QTINeon/security/advisories/GHSA-85rg-p3fr-xc2f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54609"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:40.576535784Z"}}