CVE-2026-43678

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CVSS 3.1

5.3 medium

EPSS

<1%p21

Published

Aug 20, 2026 (26d ago)

Modified

Aug 28, 2026

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.

Vendors: apple
Products: swiftnio
Weakness: CWE-20, CWE-770
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

NVD CVE.org GitHub PoCs EPSS (0.3%)

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