CVE-2026-45555

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Source
https://cve.org/CVERecord?id=CVE-2026-45555
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45555.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-45555
Aliases
  • GHSA-552p-8f74-6x7q
Published
2026-05-29T12:54:59Z
Modified
2026-10-28T02:30:52Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Roslyn CodeLens MCP Server: Untrusted Roslyn Analyzer Execution via get_diagnostics Leads to Arbitrary Code Execution
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45555.json"
}
References

Affected packages

Git / github.com/marcelroozekrans/roslyn-codelens-mcp

Affected ranges

Type
GIT
Repo
https://github.com/marcelroozekrans/roslyn-codelens-mcp
Events
Introduced
56b6300607dabae7b2cc03653909c0ea89c69058
Fixed
3ac5c0ca73a8228fc641da65e423f347dfeb9520
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0.0.9"
                },
                {
                    "fixed": "1.17.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.17.0"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}

Affected versions

v0.*
v0.0.10
v0.0.11
v0.0.12
v0.0.13
v0.0.14
v0.0.15
v0.0.9
v1.*
v1.0.0
v1.0.1
v1.0.10
v1.0.11
v1.0.12
v1.0.13
v1.0.14
v1.0.15
v1.0.2
v1.0.3
v1.0.4
v1.0.5
v1.0.6
v1.0.7
v1.0.8
v1.0.9
v1.1.0
v1.1.1
v1.1.2
v1.1.3
v1.1.4
v1.1.5
v1.1.6
v1.1.7
v1.10.0
v1.11.0
v1.12.0
v1.13.0
v1.14.0
v1.15.0
v1.16.0
v1.2.0
v1.2.1
v1.3.0
v1.4.0
v1.5.0
v1.6.0
v1.7.0
v1.8.0
v1.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45555.json"