CVE-2026-90898 Bifrost unauthenticated remote code execution via MCP stdio client registration

Bifrost registers MCP clients through its management API. A stdio client is a command plus args. Bifrost starts that program in the gateway the moment the client is added. No MCP handshake required. The default is governance.authconfig.isenabled=false. Auth off means every caller is a local admin...

local-mcp

local-mcp Zero-dependency MCP server for local file operations. 13 filesystem tools + 3 meta-tools for progressive discovery — no SDKs, no frameworks, no npm install needed. MCP Protocol: 2024-11-05 · Transport: stdio + Streamable HTTP · Runtime: Node.js ≥ 22.0.0 Architecture root@kitploit:...

CVE-2026-53937

MCP Kotlin SDK is the Kotlin Multiplatform software development kit for the Model Context Protocol. In versions 0.7.0 through 0.12.0, ReadBuffer.append in kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/shared/ReadBuffer.kt writes every chunk of bytes received from the...

CVE-2026-53937 MCP Kotlin SDK's unbounded line buffer in StdioServerTransport/StdioClientTransport leads to memory exhaustion (DoS)

MCP Kotlin SDK is the Kotlin Multiplatform software development kit for the Model Context Protocol. In versions 0.7.0 through 0.12.0, ReadBuffer.append in kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/shared/ReadBuffer.kt writes every chunk of bytes received from the...

CVE-2026-53937

CVE-2026-53937 affects the MCP Kotlin SDK (versions 0.7.0–0.12.0 ). The root cause is an unbounded kotlinx.io.Buffer in ReadBuffer.append, which grows indefinitely when the stdio transport receives a byte stream without a terminating newline. The issue is amplified by StdioServerTransport and Std...

CVE-2026-53937 MCP Kotlin SDK's unbounded line buffer in StdioServerTransport/StdioClientTransport leads to memory exhaustion (DoS)

MCP Kotlin SDK is the Kotlin Multiplatform software development kit for the Model Context Protocol. In versions 0.7.0 through 0.12.0, ReadBuffer.append in kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/shared/ReadBuffer.kt writes every chunk of bytes received from the...

EUVD-2026-74297

MCP Kotlin SDK is the Kotlin Multiplatform software development kit for the Model Context Protocol. In versions 0.7.0 through 0.12.0, ReadBuffer.append in kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/shared/ReadBuffer.kt writes every chunk of bytes received from the...

CVE-2025-6514

mcp-remote Conecta un Cliente MCP que solo soporta servidores locales stdio a un Servidor MCP Remoto, con soporte de autenticación: Nota: esto es una prueba de concepto funcional pero debe considerarse experimental. ¿Por qué es necesario? Hasta ahora, la mayoría de los servidores MCP existentes s...

CVE-2026-45018

Chainlit is a Python framework for building production-ready conversational AI applications. From 2.4.0rc0 until 2.12.0, Chainlit deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the POST /mcp endpoint without requiring authentication. For stdio transport, the...

CVE-2026-45018 Chainlit: Command injection via MCP stdio transport allows unauthenticated remote code execution

Chainlit is a Python framework for building production-ready conversational AI applications. From 2.4.0rc0 until 2.12.0, Chainlit deployments with features.mcp.enabled set to true in .chainlit/config.toml expose the POST /mcp endpoint without requiring authentication. For stdio transport, the...

CVE-2026-45018

Chainlit (Python framework for conversational AI applications) is vulnerable to command injection via its MCP stdio transport in versions 2.4.0rc0 through 2.12.0 . When features.mcp.enabled is set to true, the POST /mcp endpoint is exposed without authentication . The validate_mcp_command() funct...

EUVD-2026-50500

MCP Ruby SDK: Unbounded line buffer in stdio transports leads to memory exhaustion DoS...

CVE-2026-63119 MCP Ruby SDK: Unbounded line buffer in stdio transports leads to memory exhaustion (DoS)

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 IOgets without a byte limit, allowing a peer that sends data without a newline to exhaust process memory. This...

PT-2026-65889

Name of the Vulnerable Software and Affected Versions mcp versions prior to 0.23.0 Description The MCP::Server::Transports::StdioTransport and MCP::Client::Stdio components in the mcp gem use the IOgets function without a byte limit. This allows a peer that sends data without a newline character ...

CVE-2026-54149

MaxKB is an open-source AI assistant for enterprise. Prior to 2.10.0-lts, MaxKB tool import functionality in apps/tools/serializers/tool.py and MCP referencing mode in apps/application/chatpipeline/step/chatstep/impl/basechatstep.py do not consistently validate MCP transport type, allowing an...

CVE-2026-54149 MaxKB MCP tool import validation bypass allows post-authentication remote code execution

MaxKB is an open-source AI assistant for enterprise. Prior to 2.10.0-lts, MaxKB tool import functionality in apps/tools/serializers/tool.py and MCP referencing mode in apps/application/chatpipeline/step/chatstep/impl/basechatstep.py do not consistently validate MCP transport type, allowing an...

CVE-2026-6130

A flaw has been found in chatboxai chatbox up to 1.20.0. This impacts the function StdioClientTransport of the file src/main/mcp/ipc-stdio-transport.ts of the component Model Context Protocol Server Management System. Executing a manipulation of the argument args/env can lead to os command...

mcp-stdio-exploit

MCP STDIO Exploit: A Local Reimplementation Vulnerability...

GHSA-V4P8-MG3P-G94G LiteLLM: Authenticated command execution via MCP stdio test endpoints

Impact Two endpoints used to preview an MCP server before saving it — POST /mcp-rest/test/connection and POST /mcp-rest/test/tools/list — accepted a full server configuration in the request body, including the command, args, and env fields used by the stdio transport. When called with a stdio...

PT-2026-37190

Name of the Vulnerable Software and Affected Versions n8n-mcp versions prior to 2.47.13 Description When running in HTTP transport mode, authenticated tools/call requests have their full arguments and JSON-RPC parameters written to server logs by the request dispatcher and related code paths befo...