CVE-2026-43678
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | apple |
| Product | swift-nio |
| Ecosystems | |
| Industries | Technology |
| Published | Aug 20, 2026 |
| Last Updated | Aug 20, 2026 |
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Affected Versions
Apple / swift-nio
0 < 2.101.0