CVE-2026-45555

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 96% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.8
EG Score
7.8(medium)
EPSS
4.0%
KEV
Not listed

Published

May 29, 2026

Last Modified

June 1, 2026

Advisory Details (1)

Auto-updated Jun 4, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Untrusted Roslyn Analyzer Execution via get_diagnostics Leads to Arbitrary Code Execution · Advisory · MarcelRoozekrans/roslyn-codelens-mcp · GitHub

https://github.com/MarcelRoozekrans/roslyn-codelens-mcp/security/advisories/GHSA-552p-8f74-6x7q

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 55× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 113 total refreshes for this CVE.

  1. 2026-07-16 17:03 UTCEPSS rescore
  2. 2026-07-16 02:12 UTCEG score recompute
  3. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-29 14:06 UTCEPSS rescore
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  26. 2026-06-18 17:52 UTCEPSS rescore
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  29. 2026-06-17 17:53 UTCEPSS rescore
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  39. 2026-06-13 23:00 UTCEPSS rescore
  40. 2026-06-13 16:24 UTCEG score recompute
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  49. 2026-06-10 22:18 UTCEPSS rescore
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  56. 2026-06-08 14:17 UTCEPSS rescore
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  72. 2026-06-04 13:12 UTCEPSS rescore
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  74. 2026-06-04 07:08 UTCEG score recompute
  75. 2026-06-03 18:05 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-45555?
CVE-2026-45555 is a high vulnerability published on May 29, 2026. 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…
When was CVE-2026-45555 disclosed?
CVE-2026-45555 was first published in the National Vulnerability Database on May 29, 2026, with the most recent update on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45555 actively exploited?
CVE-2026-45555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45555?
CVE-2026-45555 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-45555?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45555, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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