CVE-2026-45555
HIGH EPSS 4.0%
Published May 29, 20261mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
Published May 29, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
4.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-94 Improper Control of Generation of Code (Code Injection) Injection
References 1
- github.com https://github.com/MarcelRoozekrans/roslyn-codelens-mcp/security/advisories/GHSA-552p-8f74-6x7q
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.