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CVE-2026-45555— Roslyn CodeLens MCP Server: Untrusted Roslyn Analyzer Execution via get_diagnostics Leads to Arbitrary Code Execution

Quick assessment

Affected
MarcelRoozekrans roslyn-codelens-mcp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Roslyn CodeLens MCP Server是Marcel Roozekrans个人开发者的一个基于Roslyn的.NET代码库深度语义分析工具。 Roslyn CodeLens MCP Server 0.0.9至1.17.0版本存在安全漏洞，该漏洞源于get_diagnostics工具加载并执行目标解决方案引用的所有DiagnosticAnalyzer程序集，无允许列表、签名检查或用户确认，可能导致攻击者放置恶意DLL实现任意代码执行。

CVSS 7.8 · High EPSS 0.21% · P11

Affected Version Matrix 1

VendorProduct Version RangeStatus
MarcelRoozekrans roslyn-codelens-mcp >= 0.0.9, < 1.17.0 affected
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I. Basic Information for CVE-2026-45555

Vulnerability Information
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Vulnerability Title
Roslyn CodeLens MCP Server: Untrusted Roslyn Analyzer Execution via get_diagnostics Leads to Arbitrary Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
Roslyn CodeLens MCP Server is a Roslyn-based MCP server providing semantic code intelligence for .NET codebases. From 0.0.9 to 1.17.0, the get_diagnostics MCP tool loads and executes all DiagnosticAnalyzer assemblies referenced by the target solution without any allowlist, signature check, or user confirmation; includeAnalyzers defaults to true, so no explicit opt-in is required. An attacker who can place a malicious .csproj referencing an attacker-controlled DLL in a location the victim opens with the MCP server will achieve arbitrary code execution in the server process with the server's OS privileges. This vulnerability is fixed in 1.17.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Roslyn CodeLens MCP Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Roslyn CodeLens MCP Server是Marcel Roozekrans个人开发者的一个基于Roslyn的.NET代码库深度语义分析工具。 Roslyn CodeLens MCP Server 0.0.9至1.17.0版本存在安全漏洞，该漏洞源于get_diagnostics工具加载并执行目标解决方案引用的所有DiagnosticAnalyzer程序集，无允许列表、签名检查或用户确认，可能导致攻击者放置恶意DLL实现任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MarcelRoozekrans roslyn-codelens-mcp >= 0.0.9, < 1.17.0 -

II. Public POCs for CVE-2026-45555

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8479 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-45555

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Vendor Advisories for CVE-2026-45555 (1)

IV. Related Vulnerabilities

Same weakness: CWE-94

V. Comments for CVE-2026-45555

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