Bug 2510734 (CVE-2026-61666) - CVE-2026-61666 websocket-driver: github.com/faye/websocket-driver-ruby: websocket-driver: Denial of Service via malformed Host header
Summary: CVE-2026-61666 websocket-driver: github.com/faye/websocket-driver-ruby: webso...
Keywords:
Status: NEW
Alias: CVE-2026-61666
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-03 18:43 UTC by OSIDB Bzimport
Modified: 2026-09-18 17:23 UTC (History)
23 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-03 18:43:39 UTC 
A denial of service vulnerability exists in websocket-driver for Ruby. A client can crash a WebSocket server by sending a Host header that is not a valid host[:port] string, which triggers an uncaught URI::InvalidURIError exception.

Affected versions: websocket-driver < 0.8.2 (RubyGems).
Fixed in websocket-driver 0.8.2, where the parser now catches URI::InvalidURIError and enters an error state when the Host header is malformed, preventing connection establishment.

No known workarounds exist.

Discovered by Pranjali Thakur of DepthFirst Security Research Team.
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