Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Fossil Mcp

The code quality toolkit for the vibe coding era.

Compatibility: Not stated.

Grade C

One Medium finding. Read the findings before installing.

Graded by PlugVetRubric v2

Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.

Rescanned at commit 35e30b831095, unchanged since the check below.

PERMISSION_SHELL_UNDECLARED

Why this grade

  • PERMISSION_SHELL_UNDECLARED Medium

    Runs shell commands that the manifest or description does not mention.

    src/rules/database.rs, line 342 // SEC003-TS: Command Injection via os.system() (Python, tree-sitter)

Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.

Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.

What was checked

Plain notes from the hygiene checks.

  • Permissions

    Concern

    requests shell access. No manifest field names shell or command execution.

    PERMISSION_SHELL_UNDECLARED

    src/rules/database.rs, line 342

    // SEC003-TS: Command Injection via os.system() (Python, tree-sitter)

    src/rules/database.rs, line 345

    // os.system("ping " + hostname)

    src/rules/database.rs, line 346

    // os.system(f"ping {hostname}")

    Show more

    src/rules/database.rs, line 349

    name: "Command Injection (AST): os.system() call".to_string(),

    src/rules/database.rs, line 350

    description: "Call to os.system() detected, which is vulnerable to command injection"

    src/rules/database.rs, line 367

    "Use subprocess.run() with shell=False and a list of arguments".to_string(),

    src/rules/semgrep_converter.rs, line 670

    - pattern: "os.system($CMD)"

    src/rules/semgrep_converter.rs, line 671

    - pattern-not: 'os.system("safe")'

  • Install and update

    Pass

    No install-time script found, and dependencies are pinned or absent.

  • Network

    Concern

    can reach a host that is not written as a fixed address.

    NETWORK_NO_FIXED_HOST

    examples/dead-code/middleware.js, line 107

    const clientRequests = (requests.get(clientId) || []).filter(

    src/update.rs, line 87

    .fetch()

    src/cli/commands/update.rs, line 30

    .fetch()

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_DOTENV

    src/dead_code/feature_flags.rs, line 139

    process_env: Regex::new(r"process\.env\.(\w+)").unwrap(),

    src/dead_code/feature_flags.rs, line 141

    import_meta_env: Regex::new(r"import\.meta\.env\.(\w+)").unwrap(),

    src/mcp/tools/scaffolding.rs, line 3593

    assert!(is_env_var_line(r#"let key = process.env.API_KEY;"#));

    Show more

    src/mcp/tools/scaffolding.rs, line 3594

    assert!(is_env_var_line(r#"key = os.environ.get("API_KEY")"#));

    src/mcp/tools/scaffolding.rs, line 3763

    writeln!(f, r#"const apiKey = process.env.OPENAI_API_KEY;"#).unwrap();

    src/mcp/tools/scaffolding.rs, line 3764

    writeln!(f, r#"const secret = process.env.CLIENT_SECRET;"#).unwrap();

    src/rules/database.rs, line 502

    description: "COPY with wildcard may include sensitive files like .env or .git"

  • Agent instructions

    Pass

    No instruction to ignore earlier instructions or to hide a step.

  • Obfuscation

    Pass

    No encoded or minified payload found.

  • Licence

    Note

    no licence file found.

    LICENCE_MISSING

    No file path was stored.

    no licence file found.

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit 35e30b831095. requests shell access. No manifest field names shell or command execution. can reach a host that is not written as a fixed address. reads a credential or environment file. no licence file found.

Date and source

Date checked:

View source

github.com

Commit graded: 35e30b831095ab58f015feab947fe1c53637ad71

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Read how this letter is chosen