SEPTEMBER 20, 2026
Live Feed
Back to database
Case File

CVE-2026-67432

HIGH · CVSS 7.5 EPSS 0.43% 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 contains a vulnerability in the StreamableHTTPTransport component that allows unauthenticated remote attackers to send oversized JSON-RPC POST requests, potentially leading to memory exhaustion and denial of service. Organizations using this SDK should prioritize upgrading to version 0.23.0 to mitigate the risk of service disruption. This issue is particularly critical for environments relying on the MCP for server-client communication.

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-2026-67432
Severity
HIGH
CVSS
7.5
EPSS
0.43%

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 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.