SEPTEMBER 19, 2026
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Case File

CVE-2026-67430

MEDIUM · CVSS 5.3 EPSS 0.31% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-29 · Last synced 2026-08-28

CyberRota Analysis

AI-Generated

The MCP Ruby SDK prior to version 0.23.0 is vulnerable due to the MCP::Server::Transports::StreamableHTTPTransport not expiring sessions by default, leading to unbounded retention of ServerSession objects that can exhaust process memory. This can result in degraded performance or crashes for applications using the SDK. Organizations utilizing this SDK should prioritize updating to version 0.23.0 to mitigate potential memory exhaustion issues.

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-2026-67430
Severity
MEDIUM
CVSS
5.3
EPSS
0.31%

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::StreamableHTTPTransport in the mcp gem does not expire sessions by default, so repeated initialize requests retain unbounded ServerSession objects and can exhaust process memory. This issue is fixed in version 0.23.0.