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CVE-2026-43678

Quick assessment

Affected
Apple swift-nio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apple swift-nio是美国Apple公司的一个跨平台的异步事件驱动型网络应用框架。 Apple swift-nio 2.101.0之前版本存在安全漏洞，该漏洞源于未经身份验证的远程对等方在完成WebSocket握手后发送单个11字节帧，可能导致任何基于NIOWebSocket的服务器崩溃，丢弃所有活动连接直到进程重启。

AI Predicted 7.5 Difficulty: Trivial EPSS 0.37% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apple swift-nio < 2.101.0 affected
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I. Basic Information for CVE-2026-43678

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Apple swift-nio 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apple swift-nio是美国Apple公司的一个跨平台的异步事件驱动型网络应用框架。 Apple swift-nio 2.101.0之前版本存在安全漏洞，该漏洞源于未经身份验证的远程对等方在完成WebSocket握手后发送单个11字节帧，可能导致任何基于NIOWebSocket的服务器崩溃，丢弃所有活动连接直到进程重启。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apple swift-nio 0 ~ 2.101.0 -

II. Public POCs for CVE-2026-43678

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III. Intelligence Information for CVE-2026-43678

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Vendor Advisories for CVE-2026-43678 (2)

Same Patch Batch · Apple · 2026-08-20 · 4 CVEs total

CVE-2026-64777 Apple container 安全漏洞
CVE-2026-43798 Apple SwiftNIO SSH 安全漏洞
CVE-2026-64773 Apple container 安全漏洞

IV. Related Vulnerabilities

Same vendor: Apple

V. Comments for CVE-2026-43678

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