CVE-2026-67431
UNKNOWN
NVD
CVSS Score
0
Severity
UNKNOWN
Published
Jul 29, 2026
Vendor
unknown
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.