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Tool Directory

CVE-2026-5029

HighPublished

RCE in Code Runner MCP Server

Published: May 12, 2026
Updated: May 12, 2026
Assigning CNA: CERT-PL
Evidence observed: Aug 28, 2026

Primary CVSS

8.7/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 21.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A remote code execution vulnerability exists in Code Runner MCP Server when run with the --transport http option, which exposes the /mcp JSON-RPC endpoint without authentication on port 3088. An unauthenticated remote attacker can invoke the run-code MCP tool to supply arbitrary source code and execute it via child_process.exec() using the specified language interpreter. This allows execution of arbitrary code with the privileges of the user running the server. This vulnerability has not been fixed and might affect the project in all versions.

Sources

CVE-2026-5029-ExploitExploit
Proof-of-concept exploit for CVE-2026-5029, delivering unauthenticated remote code execution via the run-code MCP tool on exposed HTTP endpoints. Includes interactive shell, language enumeration, and target probing.

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