CVE-2026-63119: CWE-400: Uncontrolled Resource Consumption in modelcontextprotocol ruby-sdk
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.
CVE-2026-63119: CWE-400: Uncontrolled Resource Consumption in modelcontextprotocol ruby-sdk
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.
CVSS v3.1
Score 6.2medium
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-15T16:54:55.816Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6a53159c2644c7f8f0f102
Added to database: 07/29/2026, 19:23:01 UTC
Last updated: 07/29/2026, 19:23:01 UTC
Views: 1
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