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

Downstream

Related

Published

2026-08-25T15:42:36Z

Modified

2026-10-28T02:30:27Z

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 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.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-78"
    ],
    "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

df02c8c74044a950d5c085626da8de49c7551cd5

Fixed

f31377fce6ec31114e5a4398c0e5270552bce09f

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "0.6.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "f31377fce6ec31114e5a4398c0e5270552bce09f"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v0.6.0",
            "range":  [
                {
                    "fixed":  "df02c8c74044a950d5c085626da8de49c7551cd5"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

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"