6.2
Medium
CVE-2026-63119 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::StdioTransport and MCP::Client::Stdio in the mcp gem use IO#gets without a byte limit, allowing a peer that sends data without a newline to 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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