VULNERABILITY INTELLIGENCE

CVE-2026-43678

CVSS score5.3 MEDIUM
EPSS probability0.37%
CISA KEVNot currently listed
Published2026-08-20
Last modified2026-10-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-20

Primary references