CVE-2026-43678
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk21th percentile - higher than 21% of all known CVEs
Summary
An unauthenticated remote attacker 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.
Risk Assessment
The attack can cause service disruption, leading to unavailability of applications and loss of connections for all users. It requires manual process restart, potentially resulting in downtime and reduced service availability.
Recommendation
It is recommended to immediately update swift-nio to version 2.101.0 or later to eliminate the server crash vulnerability.
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Original NVD description (English source)
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.

