High 8.9Published Aug 17, 2026

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

Updated under an hour ago (Oct 27, 2026, 2:23 PM ET)

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It affects faye websocket-driver-ruby. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for faye websocket-driver-ruby

Exploited in the last 30 days

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.

CVSS: 8.9 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-248
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

faye websocket-driver-ruby faye:websocket_driver_ruby (from the name)	before 0.8.2	CNA record

References

References

https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-2x63-gw47-w4mm	x-refsource-confirm
https://github.com/faye/websocket-driver-ruby/commit/7d6fd87759a2fdc83590d3b49ffa661dc53fa128	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.