VULNERABILITY INTELLIGENCE
CVE-2026-67432
CVSS score7.5 HIGH
EPSS probability0.78%
CISA KEVNot currently listed
Published2026-07-29
Last modified2026-10-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 reads and parses an entire JSON-RPC POST body without a size limit, allowing an unauthenticated remote attacker to exhaust process memory. This issue is fixed in version 0.23.0.
Weakness classification
- CWE-770: Allocation of Resources Without Limits or Throttling