CVE-2026-61666

websocket-driver: Denial of service via malformed Host header

HIGH
8.9
CVSS Score
Published: August 17, 2026 at 04:16 PM UTC
Updated: October 23, 2026 at 04:10 PM UTC
1 product affected across 1 vendorWebsocket Driver

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Severity
HIGH8.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 0.8.2
Affected range stops below 0.8.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.9HIGHGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-248

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