01 Record

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 WebSocket handshake, dropping all active

MediumPUBLISHEDCNA: apple

Base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

View raw JSON CVE Program record

02 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

03 Metadata

Published

2026-08-20 18:57Z1 DAY AGO

Last updated

2026-08-20 21:10Z1 DAY AGO

Reserved

2026-05-01

Assigning CNA

apple

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CVSS vector

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

Weaknesses

CWE-20Improper Input ValidationClass
CWE-770Allocation of Resources Without Limits or ThrottlingBase

SSVC decision

ExploitationnoneAutomatableyesTechnical Impactpartial

Data version

5.2

Document digest

7c944f940cf8daf7d4ad8fc578368a57897a9e93cbcaaaab65e49d9f6b525a00

04 Affected products

VendorProductVersionsPlatforms

Appleswift-nio0 to < 2.101.0—

05 References

github.comhttps://github.com/apple/swift-nio/security/advisories/GHSA-qcc5-f287-vgmq