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CVE-2026-61666— websocket-driver: Denial of service via malformed Host header

Quick assessment

Affected
faye websocket-driver-ruby
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

faye websocket-driver是faye团队的一个WebSocket协议驱动库。 faye websocket-driver 0.8.2之前版本存在异常处理不当漏洞，该漏洞源于WebSocket::Driver.server()在lib/websocket/http/request.rb中解析Host头时未捕获URI::InvalidURIError异常，可能导致基于TCP的WebSocket服务器崩溃。

CVSS 8.9 · High EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
faye websocket-driver-ruby < 0.8.2 affected
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I. Basic Information for CVE-2026-61666

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
websocket-driver: Denial of service via malformed Host header
Source: CVE Program / CVE List V5
Vulnerability Description
websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.2, WebSocket::Driver.server() passes a malformed Host header to URI.parse in lib/websocket/http/request.rb without catching URI::InvalidURIError, allowing a remote client to crash a TCP-backed WebSocket server when the application does not catch the error from parse(). This issue is fixed in version 0.8.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
faye websocket-driver 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
faye websocket-driver是faye团队的一个WebSocket协议驱动库。 faye websocket-driver 0.8.2之前版本存在异常处理不当漏洞，该漏洞源于WebSocket::Driver.server()在lib/websocket/http/request.rb中解析Host头时未捕获URI::InvalidURIError异常，可能导致基于TCP的WebSocket服务器崩溃。
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
faye websocket-driver-ruby < 0.8.2 -

II. Public POCs for CVE-2026-61666

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9975 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-61666

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Patches & Fixes for CVE-2026-61666 (1)

Vendor Advisories for CVE-2026-61666 (1)

IV. Related Vulnerabilities

Same product: websocket-driver-ruby
Same vendor: faye
Same weakness: CWE-248

V. Comments for CVE-2026-61666

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