5.3
Medium
CVE-2026-67430 MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| ruby-sdk 0.23 | earliest → < 0.23.0 | 0.23.0 |
References
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
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CVE-2026-67432
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CVE-2026-67431
MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients
8.3
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CVE-2026-63119
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CVE-2026-63118
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