CVE-2026-54465: Faye Websocket-Driver

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.1, when websocket-driver is used to implement a WebSocket server on top of a TCP server using WebSocket::Driver.server() or to complement a WebSocket client, a peer can make a single connection consume an unbounded amount of memory by sending an HTTP request or response with a never-ending list of headers. This can lead to the receiving process running out of memory. This issue is fixed in version 0.8.1.

Affected products

• Faye Websocket-Driver: before 0.8.1 (fixed in 0.8.1)

Published 2026-07-17. Last modified 2026-08-06.