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Model Context Protocol (MCP) have quickly become the interface layer between LLM agents and external tools, yet they also introduce unsafe data flows that existing analyzers handle poorly. Vulnerabilities manifest in two directions:…

Software Engineering · Computer Science 2026-05-11 Xinyi Hou , Yanjie Zhao , Haoyu Wang

Large Language Model (LLM) agents face security vulnerabilities spanning AI-specific and traditional software domains, yet current research addresses these separately. This study bridges this gap through comparative evaluation of Function…

Cryptography and Security · Computer Science 2025-07-10 Tarek Gasmi , Ramzi Guesmi , Ines Belhadj , Jihene Bennaceur

Large Language Models (LLMs) with tool-calling capabilities have demonstrated remarkable potential in executing complex tasks through external tool integration. The Model Context Protocol (MCP) has emerged as a standardized framework for…

Software Engineering · Computer Science 2026-03-24 Sarat Mudunuri , Jian Wan , Ally Qin , Srinivasan Manoharan

This paper identifies and analyzes a novel vulnerability class in Model Context Protocol (MCP) based agent systems. The attack chain describes and demonstrates how benign, individually authorized tasks can be orchestrated to produce harmful…

Cryptography and Security · Computer Science 2025-08-28 David Noever

Since the introduction of the Model Context Protocol (MCP), the number of available tools for Large Language Models (LLMs) has increased significantly. These task-specific tool sets offer an alternative to general-purpose tools such as web…

Computation and Language · Computer Science 2025-12-12 Reza Esfandiarpoor , Vishwas Suryanarayanan , Stephen H. Bach , Vishal Chowdhary , Anthony Aue

The Model Context Protocol (MCP) enables large language models to invoke external tools through natural-language descriptions, forming the foundation of many AI agent applications. However, MCP does not enforce consistency between…

Cryptography and Security · Computer Science 2026-02-04 Zhihao Li , Boyang Ma , Xuelong Dai , Minghui Xu , Yue Zhang , Biwei Yan , Kun Li

The Model Context Protocol (MCP) has rapidly become a de facto standard for connecting LLM-based agents with external tools via reusable MCP servers. In practice, however, server selection and onboarding rely heavily on free-text tool…

Software Engineering · Computer Science 2026-02-24 Peiran Wang , Ying Li , Yuqiang Sun , Chengwei Liu , Yang Liu , Yuan Tian

Large Language Model (LLM) agents increasingly interact with external systems through tool-calling protocols such as the Model Context Protocol (MCP). In prevailing architectures, the agent must reason about every tool invocation in every…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-05-05 Abhinav Singh Parmar

The Model Context Protocol (MCP) enables Large Language Models (LLMs) to interact with external tools via tool descriptors, thereby extending their capabilities for task execution, autonomous decision-making, and multi-agent coordination.…

Cryptography and Security · Computer Science 2026-05-22 Saeid Jamshidi , Arghavan Moradi Dakhel , Kawser Wazed Nafi , Foutse Khomh

Web-use agents are rapidly being deployed to automate complex web tasks with extensive browser capabilities. However, these capabilities create a critical and previously unexplored attack surface. This paper demonstrates how attackers can…

Cryptography and Security · Computer Science 2025-10-22 Avishag Shapira , Parth Atulbhai Gandhi , Edan Habler , Asaf Shabtai

Large Language Model (LLM)-based agents have demonstrated remarkable capabilities in reasoning, planning, and tool usage. The recently proposed Model Context Protocol (MCP) has emerged as a unifying framework for integrating external tools…

Cryptography and Security · Computer Science 2025-12-03 Yuanhe Zhang , Weiliu Wang , Zhenhong Zhou , Kun Wang , Jie Zhang , Li Sun , Yang Liu , Sen Su

The Model Context Protocol (MCP) enables large language models (LLMs) to dynamically discover and invoke third-party tools, significantly expanding agent capabilities while introducing a distinct security landscape. Unlike prompt-only…

Cryptography and Security · Computer Science 2026-04-10 Mehrdad Rostamzadeh , Sidhant Narula , Nahom Birhan , Mohammad Ghasemigol , Daniel Takabi

Modern LLM agents solve complex tasks by operating in iterative execution loops, where they repeatedly reason, act, and self-evaluate progress to determine when a task is complete. In this work, we show that while this self-directed loop…

Cryptography and Security · Computer Science 2026-05-08 Huiyu Xu , Zhibo Wang , Wenhui Zhang , Ziqi Zhu , Yaopeng Wang , Kui Ren , Chun Chen

We introduce MCP-Bench, a benchmark for evaluating large language models (LLMs) on realistic, multi-step tasks that demand tool use, cross-tool coordination, precise parameter control, and planning/reasoning for solving tasks. Built on the…

Computation and Language · Computer Science 2025-08-29 Zhenting Wang , Qi Chang , Hemani Patel , Shashank Biju , Cheng-En Wu , Quan Liu , Aolin Ding , Alireza Rezazadeh , Ankit Shah , Yujia Bao , Eugene Siow

Recent advances in Large Language Models (LLMs) have driven interest in automating cybersecurity penetration testing workflows, offering the promise of faster and more consistent vulnerability assessment for enterprise systems. Existing LLM…

Cryptography and Security · Computer Science 2025-11-19 Katsuaki Nakano , Reza Fayyazi , Shanchieh Jay Yang , Michael Zuzak

Model Context Protocols (MCPs) provide a unified platform for agent systems to discover, select, and orchestrate tools across heterogeneous execution environments. As MCP-based systems scale to incorporate larger tool catalogs and multiple…

Cryptography and Security · Computer Science 2026-02-19 Yuval Felendler , Parth A. Gandhi , Idan Habler , Yuval Elovici , Asaf Shabtai

The rise of tool-using Large Language Model (LLM) agents, standardized by protocols like the Model Context Protocol (MCP), has unlocked unprecedented autonomous execution capabilities for LLM Agents by integrating external open-domain…

Cryptography and Security · Computer Science 2026-05-26 Shi Liu , Xuehai Tang , Xikang Yang , Liang Lin , Biyu Zhou , Wenjie Xiao , Wantao Liu

Tool calling has emerged as a critical capability for AI agents. In contrast to conventional tool calling frameworks that rely on static, provider-specific tool definitions, the Model Context Protocol (MCP) offers a unified interface to…

The Model Context Protocol (MCP) has emerged as a de facto standard for integrating Large Language Models with external tools, yet no formal security analysis of the protocol specification exists. We present the first rigorous security…

Cryptography and Security · Computer Science 2026-01-27 Narek Maloyan , Dmitry Namiot

Large Language Models (LLMs) demonstrate strong capabilities in solving complex tasks when integrated with external tools. The Model Context Protocol (MCP) has become a standard interface for enabling such tool-based interactions. However,…

Cryptography and Security · Computer Science 2026-01-23 Jiayi Fu , Yuansen Zhang , Yinggui Wang