SEPTEMBER 18, 2026
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Case File

CVE-2026-43678

MEDIUM · CVSS 5.3 EPSS 0.29% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-20 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

NIOWebSocket-based servers, including those using Vapor and Hummingbird frameworks, are vulnerable to a denial-of-service attack that allows an unauthenticated remote peer to crash the server by sending a specific 11-byte frame after the WebSocket handshake. This results in the termination of all active connections, requiring a server restart to restore functionality. Organizations utilizing these frameworks should prioritize patching to version 2.101.0 to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-43678
Severity
MEDIUM
CVSS
5.3
EPSS
0.29%

Original NVD 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.

Related CVEs

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