Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Meridian Browser

Meridian Browser, an MCP server listed in the PlugVet directory.

Compatibility: Not stated.

Grade D

Two or more Medium findings, or a High. 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.

INSTALL_REMOTE_SCRIPT SECRETS_PATH_CREDENTIAL

Why this grade

  • INSTALL_REMOTE_SCRIPT High

    Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).

    src/updates.js, line 85 const child = spawn('/bin/bash', ['-c', `curl -fsSL ${INSTALL_SH} | bash`], {

  • SECRETS_PATH_CREDENTIAL Medium

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

    src/dev/guard.js, line 9 // id_rsa, credentials…). Only then it asks Meridian over a private local socket: a unix socket in

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.

If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.

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

    can delete files.

    PERMISSION_DELETE_FILES

    scripts/perf-bench.js, line 18

    fs.rmSync(dir, { recursive: true, force: true });

    src/agent/hub.js, line 666

    try { fs.unlinkSync(this.endpointPath); } catch {}

    src/agent/hub.js, line 691

    try { fs.unlinkSync(this.endpointPath); } catch {}

    Show more

    src/agent/hub.js, line 692

    if (process.platform !== 'win32' && this.socketPath) { try { fs.unlinkSync(this.socketPath); } catch {} }

    src/agent/hub.js, line 693

    if (this.tmpDir) { try { fs.rmSync(this.tmpDir, { recursive: true, force: true }); } catch {} this.tmpDir = null; }

    src/agents/channel.js, line 184

    try { fs.rmSync(st.dir, { recursive: true, force: true }); } catch {}

    src/agents/channel.js, line 191

    if (this.dir) { try { fs.rmSync(this.dir, { recursive: true, force: true }); } catch {} this.dir = null; }

    src/ai/assistant.js, line 55

    if (!key) { try { fs.unlinkSync(this.keyFile); } catch {} return; }

  • Install and update

    Serious

    install fetches a script from the network. README documents an installer that pipes a download into a shell. The docs document an installer that pipes a download into a shell.

    INSTALL_REMOTE_SCRIPT INSTALL_DOCUMENTED_INSTALLER

    README.md, line 55

    curl -fsSL https://undermove.github.io/meridian-browser/install.sh | bash

    docs/install.sh, line 4

    # curl -fsSL https://undermove.github.io/meridian-browser/install.sh | bash

    src/updates.js, line 85

    const child = spawn('/bin/bash', ['-c', `curl -fsSL ${INSTALL_SH} | bash`], {

    Show more

    src/ai/local-agents.js, line 83

    install: { mac: 'curl https://cursor.com/install -fsS | bash', linux: 'curl https://cursor.com/install -fsS | bash', win: null },

    src/ai/local-agents.js, line 116

    all opencode', needs: 'brew' }, { cmd: 'curl -fsSL https://opencode.ai/install | bash' }], linux: 'curl -fsSL https://opencod

    src/ai/local-agents.js, line 167

    install: { mac: 'curl -fsSL https://ampcode.com/install.sh | bash', linux: 'curl -fsSL https://ampcode.co

    src/ai/local-agents.js, line 205

    install: { mac: 'curl -fsSL https://app.factory.ai/cli | sh', linux: 'curl -fsSL https://app.factory.ai/cli | sh', win: [{ cmd: 'npm install -g droid', needs: 'npm' }] },

    src/ai/local-agents.js, line 228

    ll llama3.2', needs: 'brew' }], linux: 'curl -fsSL https://ollama.com/install.sh | sh && ollama pull llama3.2', win: null },

    src/dev/agents.js, line 27

    opencode: { label: 'OpenCode', bin: 'opencode', install: 'curl -fsSL https://opencode.ai/install | bash', mcp: true, extra: true },

    src/dev/agents.js, line 28

    cursor: { label: 'Cursor', bin: 'cursor-agent', install: 'curl https://cursor.com/install -fsS | bash', mcp: false, extra: true },

    src/dev/agents.js, line 32

    droid: { label: 'Droid', bin: 'droid', install: 'curl -fsSL https://app.factory.ai/cli | sh', mcp: false, extra: true },

    package.json, line 15

    postinstall

    docs/index.html, line 194

    <div class="cmd"><code id="cmd-unix">curl -fsSL https://undermove.github.io/meridian-browser/install.sh | bash</code><button class="copy" data-copy="cmd-unix"><svg viewBox="0 0 24

    docs/index.html, line 238

    <div class="cmd"><code id="cmd-linux">curl -fsSL https://undermove.github.io/meridian-browser/install.sh | bash</code><button class="copy" data-copy="cmd-linux"><svg viewBox="0 0 2

  • Network

    Concern

    can reach a host that is not written as a fixed address. can reach user. The description does not name that host. can reach api.github.com. The description does not name that host.

    NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST

    docs/install.sh, line 19

    command -v curl >/dev/null || fail "curl is needed."

    docs/install.sh, line 38

    RELEASE="$(curl -fsSL -H 'Accept: application/vnd.github+json' "$API")" || fail "Couldn't reach GitHub. Check your internet connection and try again."

    docs/install.sh, line 49

    curl -fL --progress-bar -o "$TMP/$FILE" "$URL" || fail "Download failed."

    Show more

    docs/install.sh, line 52

    curl -fsSL -o "$TMP/SHA256SUMS.txt" "$SUMS_URL" || fail "Couldn't download the checksums."

    docs/install.sh, line 72

    # Files fetched with curl aren't quarantined, but clear the flag in case something added it.

    docs/install.sh, line 87

    curl -fsSL -o "$HOME/.local/share/icons/hicolor/512x512/apps/meridian.png" \

    mcp/meridian-mcp.js, line 52

    const req = http.request({

    src/main.js, line 816

    const res = await session.fromPartition(partition).fetch(url, { signal: AbortSignal.timeout(8000) });

    src/ai/local-agents.js, line 186

    ck-goose-cli', needs: 'brew' }, { cmd: 'curl -fsSL https://github.com/aaif-goose/goos

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_CREDENTIAL SECRETS_PATH_DOTENV

    mcp/meridian-mcp.js, line 31

    const SESSION_HASH = process.env.MERIDIAN_MISSION_TOKEN ? require('crypto').createHash('sha256').update(process.env.MERIDIAN_MISSION_TOKEN).digest('hex').slice(0, 32) : null;

    src/main.js, line 1757

    const forcedLocked = DEV && process.env.MERIDIAN_E2E_KEYCHAIN === 'locked';

    src/dev/guard.js, line 9

    // id_rsa, credentials…). Only then it asks Meridian over a private local socket: a unix socket in

    Show more

    src/agent/hub.js, line 554

    .startsWith(d + path.sep)) || /(^|[\\/])\.env(\.|$)|\.(pem|key|p12|pfx|keychain-db)$/

    src/agents/hooks/mission-hook.js, line 111

    const token = process.env.MERIDIAN_MISSION_TOKEN;

    src/ai/assistant.js, line 51

    return fs.existsSync(this.keyFile) || !!process.env.ANTHROPIC_API_KEY;

    src/ai/assistant.js, line 89

    if (!apiKey && !process.env.ANTHROPIC_API_KEY) throw new Error('Add your Anthropic API key in Settings → AI.');

    src/ai/local-agents.js, line 399

    const child = spawnSafe(bin, args, { env: { ...env, ...(spec.env || {}) }, cwd });

    src/dev/agents.js, line 12

    // and for Claude Code a line in its system prompt), so it uses them instead of hunting for the blank .env values.

    src/dev/agents.js, line 39

    + 'Don\'t ask the user to paste them, don\'t write their values into files or logs, and when a script loads a .env file, don\'t let it override variables that are already set.';

    src/dev/agents.js, line 123

    )}). If ${agent.label} looks for them in .env, tell it to read the environment variab

    src/dev/env.js, line 119

    return { ...env, ...extra };

    src/dev/guard.js, line 8

    // - The hook decides locally whether a tool call touches a secret-looking file (.env, *.pem,

    src/dev/index.js, line 157

    this.vault = new Vault(path.join(app.getPath('userData'), 'vault.json'), { testKeychain: !app.isPackaged && process.env.MERIDIAN_TEST_KEYCHAIN === '1' });

    src/dev/hooks/secret-guard-hook.js, line 82

    const token = process.env.MERIDIAN_GUARD_TOKEN;

  • 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.

    OBFUSCATION_FILE_OVER_READ_CAP

    THIRD_PARTY_NOTICES.md, line 1

    # Third-party notices

  • 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 f514da76c5db. can delete files. install fetches a script from the network. README documents an installer that pipes a download into a shell. The docs document an installer that pipes a download into a shell. can reach a host that is not written as a fixed address. can reach user. The description does not name that host. can reach api.github.com. The description does not name that host. reads a credential or environment file. a file was over the read cap and was not fully read.

Date and source

Date checked:

View source

github.com

Commit graded: f514da76c5db178f37ed7c0f18e2ae5e19c86fb6

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