MEDIUM 5.3 NVD

CVE-2026-43678

An unauthenticated remote peer can crash any NIOWebSocket-based server (including Vapor and Hummingbird) with a single 11-byte frame sent after a completed WebS

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.

References

https://github.com/apple/container/security/advisories/GHSA-2v2q-4q35-h585

Published: 2026-08-20 · Source: NVD · Feed updated: 2026-08-20

This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-08-20 via NVD.

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