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CVE-2026-55580— mcp-shell — Security Disabled by Default in Bare-Binary Deploy Path + Shell Interpreter in Secure-Mode Allowlist

Quick assessment

Affected
sonirico mcp-shell
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mcp-shell 是一个 MCP（Model Context Protocol）服务器，用于安全、可审计且按需执行 Shell 命令。在版本 0.6.0 之前，config.go 将 Security.Enabled 初始化为 false；当未设置环境变量 MCP_SHELL_SEC_CONFIG_FILE 时，main.go 会启动文档中描述的裸二进制部署模式，且不带任何安全策略。随后，security.go 中的 SecurityValidator.validateCommand 函数会短路处理，允许传入 s

CVSS 8.6 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
sonirico mcp-shell < 0.6.0 affected
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I. Basic Information for CVE-2026-55580

Vulnerability Information
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Vulnerability Title
mcp-shell — Security Disabled by Default in Bare-Binary Deploy Path + Shell Interpreter in Secure-Mode Allowlist
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sonirico mcp-shell < 0.6.0 -

II. Public POCs for CVE-2026-55580

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7130 chars
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III. Intelligence Information for CVE-2026-55580

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Patches & Fixes for CVE-2026-55580 (2)

Vendor Advisories for CVE-2026-55580 (1)

Vendor Pages for CVE-2026-55580 (1)

Same Patch Batch · sonirico · 2026-08-25 · 3 CVEs total

CVE-2026-55582 8.4 HIGH mcp-shell: Secure Mode Allowlist Bypass via Git Shell Alias
CVE-2026-55581 8.4 HIGH mcp-shell: Secure Mode Allowlist Bypass via Default `/bin/bash` Executable

IV. Related Vulnerabilities

Same product: mcp-shell
Same vendor: sonirico
Same weakness: CWE-78

V. Comments for CVE-2026-55580

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