What is CVE-2026-45555?

CVE-2026-45555 is a high-severity vulnerability in Marcelroozekrans Roslyn-codelens-mcp, classified under Code Injection. CVSS score: 7.8/10. Published 2026-05-29.

How severe is CVE-2026-45555?

High severity. CVSS v3 base score is 7.8 out of 10.

RCE in Marcelroozekrans Roslyn-codelens-mcp

CVE-2026-45555

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 targ…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.000 (7.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Marcelroozekrans Roslyn-codelens-mcp — versions >= 0.0.9, < 1.17.0

Weakness classification (CWE)

CWE-94 — Code Injection

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-45555?: CVE-2026-45555 is a high-severity vulnerability in Marcelroozekrans Roslyn-codelens-mcp, classified under Code Injection. CVSS score: 7.8/10. Published 2026-05-29.
How severe is CVE-2026-45555?: High severity. CVSS v3 base score is 7.8 out of 10.