What is CVE-2026-5029?

CVE-2026-5029 is a vulnerability in Code Runner Mcp Server, classified under Missing Authentication for Critical Function. Published 2026-05-12.

Is CVE-2026-5029 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Code Runner Mcp Server

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 t…

Vulnerability class: Broken Authentication

EPSS: 0.003 (21.0th percentile) — read the EPSS interpretation.

Affected products

Code Runner Mcp Server — versions 0

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

Public proof-of-concept exploits

0x00phantom-hat/CVE-2026-5029-Exploit

References

cvd@cert.pl (third-party-advisory)

Frequently asked questions

What is CVE-2026-5029?: CVE-2026-5029 is a vulnerability in Code Runner Mcp Server, classified under Missing Authentication for Critical Function. Published 2026-05-12.
Is CVE-2026-5029 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.