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CVE-2026-5029

RCE in Code Runner MCP Server

HIGH
8.7
CVSS Score
Published: May 12, 2026 at 09:01 AM UTC
Updated: June 17, 2026 at 10:58 AM UTC
1 product affected across 1 vendorCode Runner MCP Server

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Severity
HIGH8.7
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Third Party Advisory
Source: cverecord
https://cert.pl/en/posts/2026/05/CVE-2026-5029

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHCERT-PL
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-306

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