CVE-2026-63119: falha de média gravidade em modelcontextprotocol ruby-sdk
MCP Ruby SDK: Unbounded line buffer in stdio transports leads to memory exhaustion (DoS)
Publicada em
Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.
13Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 6.2epss 0.2%
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:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Produtos afetados
modelcontextprotocol · ruby-sdkCVEs relacionadas — modelcontextprotocol ruby-sdk
No mesmo produto, das mais perigosas para as menos.
CVE-2026-67432HIGHMCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in StreamableHTTPTransportEPSS 0.8%CVE-2026-33946HIGHMCP Ruby SDK: Insufficient Session Binding Allows SSE Stream Hijacking via Session ID ReplayEPSS 0.5%CVE-2026-67430MEDIUMMCP Ruby SDK: Unbounded session retention in StreamableHTTPTransport allows memory exhaustion via initialize floodEPSS 0.4%CVE-2026-67431HIGHMCP Ruby SDK: Ruby SSE Session PoisoningEPSS 0.4%CVE-2026-63118MEDIUMMCP Ruby SDK: Streamable HTTP transport lacks DNS-rebinding (Host/Origin) protectionEPSS 0.2%