Is CVE-2026-5029 actively exploited?

No active exploitation of CVE-2026-5029 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-5029 be exploited remotely?

Partially. CVE-2026-5029 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-5029?

CVE-2026-5029 has a CVSS score of 8.7 (HIGH).

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HIGH

CVE-2026-5029

CWE-306Published: May 12, 2026· Updated: May 12, 2026

8.7

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:15.7th

Official 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.

NVD Source

Technical Analysis

CVE-2026-5029 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorAdjacent

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X