CVE-2026-62963: Centrifugal Centrifugo

High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days.

Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.4, Centrifugo unidirectional WebSocket transport with uni_websocket.compression enabled enforced uni_websocket.message_size_limit against compressed wire-frame length in internal/websocket/conn.go advanceFrame, but ReadMessage used io.ReadAll after decompression without an output cap, allowing unauthenticated requests to /connection/uni_websocket to trigger large memory and CPU consumption. This issue is fixed in version 6.8.4.

Affected products

• Centrifugal Centrifugo: before 6.8.4 (fixed in 6.8.4)

Published 2026-07-16. Last modified 2026-07-17.