CVE-2026-43678

MediumCVSS 5.3/10Last modified Oct 18, 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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-20 CWE-770

Affected software

No affected versions have been published.

Timeline

Published: Aug 20, 2026
Last modified: Oct 18, 2026
NVD status: Analyzed

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