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CVE-2026-55580: Product identification pending

Severity

8.6 (HIGH)

Affected versions

Before 0.6.0

Fixed version

0.6.0.

Patch status

Patched

Published

2026-08-25T16:16:55.317

Modified

2026-08-25T17:17:32.743

Why it matters

This matters because the affected product may allow code execution. Prioritize systems that are internet-facing or have privileged access to other infrastructure.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.
• Compare installed versions against the affected version range in the advisory.
• Review logs for suspicious activity related to the affected application or component.

Technical summary

mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, config.go initializes Security.Enabled to false, and when MCP_SHELL_SEC_CONFIG_FILE is unset, main.go starts the documented bare-binary deployment without a security policy. SecurityValidator.validateCommand in security.go then short-circuits and allows every command supplied to the shell_exec MCP tool, so an LLM connected over stdio can execute unrestricted OS commands as the mcp-shell process user. The README from-source installation and MCP client configuration omit MCP_SHELL_SEC_CONFIG_FILE, making the insecure state the documented default. This issue is fixed in version 0.6.0.

View the official NVD record for CVE-2026-55580

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.