CVE-2026-63119 | CyberRota

CyberRota Analysis

AI-Generated

The MCP Ruby SDK is vulnerable due to the use of IO#gets without a byte limit in the StdioTransport and Stdio client components, which can lead to memory exhaustion if a peer sends unbounded data. This could result in denial-of-service conditions for applications utilizing the SDK. Developers and system administrators using versions prior to 0.23.0 should prioritize upgrading to mitigate potential service disruptions.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

github.com ↗ github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE

CVE-2026-63119

Severity

MEDIUM

CVSS

6.2

EPSS

0.13%

Original NVD Description

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to 0.23.0, MCP::Server::Transports::StdioTransport and MCP::Client::Stdio in the mcp gem use IO#gets without a byte limit, allowing a peer that sends data without a newline to exhaust process memory. This issue is fixed in version 0.23.0.