PT-2026-65899 · Rubygems · Mcp

CVE-2026-67432

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Published

2026-07-29

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Updated

2026-07-30

CVSS v3.1

7.5

High

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Name of the Vulnerable Software and Affected Versions mcp versions prior to 0.23.0
Description The MCP::Server::Transports::StreamableHTTPTransport component in the mcp gem reads and parses an entire JSON-RPC POST body without enforcing a size limit. This allows an unauthenticated remote attacker to cause process memory exhaustion by sending an excessively large request body.
Recommendations Update to version 0.23.0.

Exploit

Fix

Allocation of Resources Without Limits

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Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-67432
GHSA-H669-8M4G-R2HC

Affected Products

Mcp