High 8.7Published May 12, 2026

CVE-2026-5029RCE in Code Runner MCP Server

Updated under an hour ago (Oct 26, 2026, 10:50 AM ET)

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It affects Code Runner MCP Server. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: CERT-PL
NVD analysis: Awaiting Analysis
Record last updated: May 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Code Runner MCP Server Code Runner MCP Server code_runner_mcp_server:code_runner_mcp_server (from the name)	all versions	CNA record

References

https://cert.pl/en/posts/2026/05/CVE-2026-5029third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.