CVE-2026-43678 An unauthenticated remote peer can crash any NIOWebSocket-based server (including Vapor and Hummingbird) with a single…

Description

An unauthenticated remote peer can crash any NIOWebSocket-based server (including Vapor and Hummingbird) with a single 11-byte frame sent after a completed WebSocket handshake, dropping all active connections until the process restarts. This vulnerability is addressed in swift-nio version 2.101.0.

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