Vulnerabilities CVE-2026-67430

CVE-2026-67430

Medium

Open

TLP:CLEAR

MCP Ruby SDK: Unbounded session retention in StreamableHTTPTransport allows memory exhaustion via initialize flood

NVD CVE.org

AI Analysis

No AI analysis yet.

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.

Details

CVSS Score: 5.3
EPSS Score ⓘ: 0.29%

21.5th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Confidence: 90%
Published: Jul 29, 2026
Last Modified: Jul 30, 2026

Notes

No notes yet. Click "Add Note" to create the first analysis note.

Opinions

No opinions yet. Be the first to assess this intelligence.