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CVE-2026-63119

MEDIUM CVSS: 6.2 Published: 2026-07-29 Modified: 2026-07-30

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.

Affected Platforms

Unknown

Weakness Type

CWE-400, CWE-770

References