PT-2026-65897 · Rubygems · Mcp

CVE-2026-67430

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Published

2026-07-29

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Updated

2026-07-30

CVSS v3.1

5.3

Medium

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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 does not expire sessions by default. Consequently, repeated initialize requests lead to the retention of unbounded ServerSession objects, which can result in the exhaustion of process memory.
Recommendations Update to version 0.23.0.

Exploit

Fix

Allocation of Resources Without Limits

Memory Leak

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Weakness Enumeration

CWE-770CWE-401

Related Identifiers

CVE-2026-67430
GHSA-52JP-GJ8W-J6XH

Affected Products

Mcp