Grades are a hygiene check, not a security guarantee.

MCP, MCP server

McpMux

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Compatibility: Not stated.

Grade D

Two or more Medium findings, or a High finding. Only try it in a sandbox.

Graded by PlugVetRubric v2

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

Rescanned at commit 2e6a5b925eb4, unchanged since the check below.

INSTALL_LIFECYCLE_HOOK SECRETS_PATH_CREDENTIAL

Why this grade

  • INSTALL_LIFECYCLE_HOOK Medium

    A package install hook (preinstall, install, postinstall or prepare) runs a script.

    README.md, line 174 > **Linux quick install:** `curl -fsSL https://install.mcpmux.com | bash`

  • SECRETS_PATH_CREDENTIAL Medium

    Mentions a credential store path (~/.ssh, id_rsa, .npmrc, .aws/credentials, credentials.json, .netrc).

    crates/mcpmux-storage/src/keychain_file.rs, line 5 //! restrictive permissions (0600 on Unix), similar to how SSH protects `~/.ssh/` keys.

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

    Pass

    No shell or command execution found, and no extra permission was declared.

  • Install and update

    Concern

    runs a script at install time. README documents an installer that pipes a download into a shell.

    INSTALL_LIFECYCLE_HOOK INSTALL_DOCUMENTED_INSTALLER

    README.md, line 174

    > **Linux quick install:** `curl -fsSL https://install.mcpmux.com | bash`

    README.md, line 186

    curl -fsSL https://install.mcpmux.com | bash

    README.md, line 194

    curl -fsSL https://install.mcpmux.com/apt | sudo bash

    Show more

    package.json, line 8

    prepare

  • Network

    Concern

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

    NETWORK_NO_FIXED_HOST

    apps/desktop/src/hooks/useServerManager.ts, line 118

    // Initial fetch (only on mount, not on space change since handled above)

    crates/mcpmux-core/src/service/cimd_fetcher.rs, line 77

    pub async fn fetch(&self, client_id_url: &str) -> Result<CimdMetadata> {

    crates/mcpmux-core/src/service/cimd_fetcher.rs, line 324

    .fetch("https://localhost:9/client.json")

    Show more

    crates/mcpmux-core/src/service/server_discovery.rs, line 53

    /// Cached ETag from last successful API fetch (in-memory cache)

    crates/mcpmux-core/src/service/server_discovery.rs, line 265

    info!("Cache file missing, forcing fresh fetch (ignoring stored ETag)");

    crates/mcpmux-gateway/src/server/state.rs, line 224

    /// fetch (10 s timeout), and `GatewayState`'s write-preferring RwLock

    crates/mcpmux-gateway/src/services/client_metadata_service.rs, line 75

    let mut metadata = self.cimd_fetcher.fetch(client_id_url).await?;

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_CREDENTIAL SECRETS_PATH_DOTENV

    apps/daemon/src/control/handlers.rs, line 1322

    .env

    apps/desktop/src/lib/analytics.ts, line 22

    // so a missing/empty key here means restart dev or check apps/desktop/.env*.

    crates/mcpmux-storage/src/keychain_file.rs, line 5

    //! restrictive permissions (0600 on Unix), similar to how SSH protects `~/.ssh/` keys.

    Show more

    apps/desktop/src/lib/serverLaunch.ts, line 50

    const assignments = [...env].map(([key, value]) => `${showHidden(key)}=${shellQuote(value)}`);

    apps/desktop/src-tauri/src/lib.rs, line 74

    // Load .env file if present (development builds only). A release build must

    apps/desktop/src-tauri/src/lib.rs, line 75

    // not pick up settings from a .env in whatever directory it was launched

    apps/desktop/src-tauri/src/lib.rs, line 80

    dotenvy::from_filename("../.env").ok(); // apps/desktop/.env when run from src-tauri

    .gitignore, line 10

    # Environment & Secrets

  • Agent instructions

    Pass

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

  • Obfuscation

    Note

    a file was over the read cap and was not fully read. the file cap was reached before every file was read.

    OBFUSCATION_FILE_OVER_READ_CAP OBFUSCATION_FILE_CAP_REACHED

    pnpm-lock.yaml, line 1

    lockfileVersion: '9.0'

    apps/desktop/src-tauri/icons/icon.icns, line 1

    icns��ic12��PNG

    docs/guide/index.mdx, line 1

    ---

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

Get the full report on this tool, £49

Note

Hygiene check of commit 2e6a5b925eb4. runs a script at install time. README documents an installer that pipes a download into a shell. can reach a host that is not written as a fixed address. reads a credential or environment file. a file was over the read cap and was not fully read. the file cap was reached before every file was read.

Date and source

Date checked:

View source

github.com

Commit graded: 2e6a5b925eb4b2df1ffb292b1216101aef872f0c

This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.

Read how this letter is chosen