RCE in Code Runner MCP Server
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.7epss 0.3%
from disclosure to weapon69 days
Published on NVDMay 12
1st PoC+69d
exploitation probability
0.3%top 79% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
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
Affected products
Code Runner MCP Server · Code Runner MCP Serverpublic PoCs found — 1
githubgithub.com/0x00phantom-hat/CVE-2026-5029-Exploit★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.