A critical integer handling vulnerability in the faye websocket-driver-node library allows remote, unauthenticated attackers to corrupt payload parsing and potentially cause service instability.

The flaw exists in the frame format processing within the draft WebSocket protocol implementation: an unauthenticated attacker can supply an indefinite sequence of bytes that causes the internal length integer to grow until it loses precision, leading to incorrect payload parsing.

This vulnerability poses a significant risk to the integrity of data processed over WebSockets. Because the payload can be parsed incorrectly, attackers may be able to bypass security controls or inject malicious data streams into the backend application. Given the CVSS score of 9.2, this represents a severe risk to application stability and data integrity, potentially leading to unauthorized system behavior.

Immediate Action: Upgrade the faye websocket-driver-node dependency to version 0.7.5 or later immediately.

Proactive Monitoring: Monitor server logs for unusually long or malformed WebSocket frames and investigate any unexpected application crashes associated with WebSocket connections.

Compensating Controls: Implement strict input validation at the application layer or utilize a Web Application Firewall (WAF) configured to inspect and limit the size of incoming WebSocket frames.

Public Exploit Available: No (exploit_available: false)

This vulnerability is critical due to its potential for remote exploitation and the fundamental nature of the affected protocol handler. Organizations should prioritize updating the affected library across all production environments to eliminate the risk of payload manipulation and potential service disruption.