Report an incident
Back
  • About us
  • For experts
Report an incident
About us
About our team Contact
Baza wiedzy
Fałszywe inwestycje Uważaj na fałszywe sklepy online (Nie)bezpieczne płatności Fałszywi konsultanci Zadbaj o bezpieczne hasła i logowanie Fałszywe załączniki w mailach Fałszywe prośby o szybki przelew Bezpieczny telefon
Biuletyn OUCH!
Porady bezpieczeństwa OUCH!
Tools
n6 Artemis MWDB
CVD program
CVD policy Advisories

Vulnerability in Code Runner MCP Server project
12 May 2026 | CERT Polska | #vulnerability, #warning, #cve
CVE ID CVE-2026-5029
Publication date 12 May 2026
Vendor Code Runner MCP Server
Product Code Runner MCP Server
Vulnerable versions All
Vulnerability type (CWE) Missing Authentication for Critical Function (CWE-306)
Report source Report to CERT Polska

Description

CERT Polska has received a report about vulnerability in Code Runner MCP Server software and participated in coordination of its disclosure.

The vulnerability CVE-2026-5029: 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.

Credits

We thank Eryk Winiarz for the responsible vulnerability report.

More about the coordinated vulnerability disclosure process at CERT Polska can be found at https://cert.pl/en/cvd/.