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
2026-09-11T03:30:27Z
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
0 Unknown introduced commit / All previous commits are affected
Fixed
f31377fce6ec31114e5a4398c0e5270552bce09f
Fixed
df02c8c74044a950d5c085626da8de49c7551cd5
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.6.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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"