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CVE-2026-67431

N/A CVSS: N/A 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::StreamableHTTPTransport in the mcp gem does not bind a session ID to a session owner, allowing an attacker with a stolen session ID to send tools/call requests that execute in the victim's session. This issue is fixed in version 0.23.0.

Affected Platforms

Unknown

Weakness Type

CWE-284

References