CVE-2026-55580

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Source

https://cve.org/CVERecord?id=CVE-2026-55580

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55580.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-55580

Aliases

Published

2026-08-25T15:42:36.474Z

Modified

2026-08-27T11:47:33.999070661Z

Severity

8.6 (High) CVSS_V4 - 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 CVSS Calculator

Summary

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

Details

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 MCPSHELLSECCONFIGFILE 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 shellexec 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 MCPSHELLSECCONFIG_FILE, making the insecure state the documented default. This issue is fixed in version 0.6.0.

Database specific

{
    "cwe_ids": [
        "CWE-78"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55580.json"
}

References

Affected packages

Git / github.com/sonirico/mcp-shell

Affected ranges

Type

GIT

Repo

https://github.com/sonirico/mcp-shell

Events

Introduced

Fixed

f31377fce6ec31114e5a4398c0e5270552bce09f

Fixed

df02c8c74044a950d5c085626da8de49c7551cd5

Database specific

Show details

{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.6.0"
        }
    ]
}

Affected versions

v0.*

v0.1.0

v0.2.0

v0.2.2

v0.3.0

v0.3.1

v0.4.0

v0.5.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55580.json"