CVE-2026-67430

5.3 MEDIUM
Published: July 29, 2026 Modified: July 30, 2026
View on 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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/modelcontextprotocol/ruby-sdk/commit/afb968c468c178c4d3294b423fcce250621692f4
Source: security-advisories@github.com
https://github.com/modelcontextprotocol/ruby-sdk/releases/tag/v0.23.0
Source: security-advisories@github.com
https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-52jp-gj8w-j6xh
Source: security-advisories@github.com
https://github.com/modelcontextprotocol/ruby-sdk/security/advisories/GHSA-52jp-gj8w-j6xh
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

4 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.3 / 10.0
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-401 CWE-770

Related CVEs

CVE-2026-66416 8.8
CVE-2026-66415 8.5
CVE-2026-66066 N/A
CVE-2026-64870 N/A
CVE-2026-61536 7.5