pennyrouter@0.3.37

Install and manage PennyRouter local coding-agent integrations.

AI Security Review

scanned 11d ago · by lpm-firewall-ai

The manifest declares no npm lifecycle hook, and the inspected integration paths are consistent with a user-invoked CLI installer and local session handling. Scanner signals alone do not establish malicious behavior.

Static reason

One or more suspicious static signals were detected.; previous stored version diff introduced dangerous source

Trigger

A user invokes the PennyRouter install command to configure integrations.

Impact

No confirmed harmful impact or attack surface was established.

Mechanism

The package selects PennyRouter-specific configuration paths and reads local agent settings for integration behavior; no unconsented install-time mutation or credential exfiltration was established.

AI rationale

Decision evidence

public snapshot

AI called this Clean at 90.0% confidence as Benign with low false-positive risk.

Evidence for AI clean decision

package.json exposes a CLI and lists only start and check scripts; no install lifecycle hook is declared.
src/cli.js dispatches the install behavior only when the user invokes the install command.
src/statusline.js reads Claude Code settings as part of its statusline integration; src/launch.js selects a PennyRouter-specific Codex profile file.
The thread-session modules and web demo access local agent session directories; the inspected excerpts show no attack behavior.
The remaining required source locations contain local path handling, test setup, or MCP integration context, with no confirmed attack surface.

Evidence against

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetworkShellWebSocket

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

Source & flagged code

10 flagged

standalone/web-demo/server.mjsView file

Lines 1-23javascript

1import { createServer } from 'node:http';

2import { randomUUID } from 'node:crypto';

3import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises';

4import { spawn, execFile } from 'node:child_process';

5import { join, dirname } from 'node:path';

High

Child Process

Package source references child process execution.

standalone/web-demo/server.mjsView on unpkg · L3

6import { tmpdir } from 'node:os';

7import { fileURLToPath } from 'node:url';

8import { promisify } from 'node:util';

9import { WebSocketServer } from 'ws';

10import pty from 'node-pty';

11import { ClaudeMeter, saveReport } from './claude-meter.mjs';

13const here = dirname(fileURLToPath(import.meta.url));

14const compareDir = dirname(here);

15const execFileAsync = promisify(execFile);

16const args = process.argv.slice(2);

17const claude = args.includes('--claude');

18const nodeMeter = args.includes('--compare-node') ||

19 (args.includes('--compare') && process.platform === 'win32');

20const compare = args.includes('--compare') || nodeMeter;

21const pythonCompare = compare && !nodeMeter && process.platform !== 'win32';

22const portArg = args.find((arg) => /^--port=\d+$/.test(arg));

23const port = Number(portArg?.slice(7) ?? 8789);

Lines 196-228javascript

196 session.onData((data) => send({ type: 'output', side: message.side, data }));

197 session.onExit(({ exitCode }) => {

198 sessions.delete(message.side);

199 send({ type: 'exit', side: message.side, code: exitCode });

src/launch.jsView file

Lines 338-378javascript

338 let replace = false;

339 try {

340 replace = (await lstat(link)).isSymbolicLink();

341 } catch (error) {

342

src/launch.test.jsView file

Lines 1-21javascript

1import assert from "node:assert/strict";

2import { spawnSync } from "node:child_process";

3import fs from "node:fs";

Medium

Install Persistence

Source writes installer persistence such as shell profile or service configuration.

src/launch.test.jsView on unpkg · L1

4import

src/harnesses/codegpt.jsView file

Lines 1-21javascript

1import { spawnSync } from "node:child_process";

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

src/harnesses/codegpt.jsView on unpkg · L1

3export const codeGptHarness = {

4 id: "codegpt",

src/statusline.jsView file

•Runtime or CLI code links a write operation to an explicit external AI-agent control path: tatusline (all lines) |] penny segment (penny / penny (sub) // / penny (byok) / penny off). the wrapped statusline's first line gets the penny suffix; // any further lines (e.g. a context bar) pass through verbatim. // never blocks on the network: reads a per-session cache and refreshes it detached. import { readfilesync, mkdirsync, writefilesync, statsync } from "node:fs"; import { spawn, spawnsync } from "node:child_process"; import { join, basename } from "node:path"; import os from "node:os"; const statedir = join( process.env.xdg_state_home || join(os.homedir(), ".local", "state"), "pennyrouter", ); const cachedir = join(statedir, "statusline-cache"); const titlesessionfile = process.env.pe

High

External Ai Agent Control Surface Mutation

Runtime or CLI source writes behavior-bearing configuration into a user or project AI-agent control surface.

src/statusline.jsView on unpkg

standalone/claude-proxy.shView file

•path = standalone/claude-proxy.sh kind = build_helper sizeBytes = 8224 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

standalone/claude-proxy.shView on unpkg

src/mcp-register.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

src/mcp-register.js#virtual:normalized:round1View on unpkg

src/cli.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = pennyrouter@0.3.17 matchedIdentity = npm:cGVubnlyb3V0ZXI:0.3.17 similarity = 0.710 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

src/cli.jsView on unpkg

Source & flagged code

10 flagged · loading source

standalone/web-demo/server.mjsView file

3import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises'; L4: import { spawn, execFile } from 'node:child_process'; L5: import { join, dirname } from 'node:path';

High

Child Process

Package source references child process execution.

standalone/web-demo/server.mjsView on unpkg · L3

216server.listen(port, '127.0.0.1', () => { L217: const url = `http://127.0.0.1:${port}`; L218: console.log(`Penny Compare live terminal demo: ${url}`); ... L221: if (process.platform === 'win32') { L222: execFile(process.env.ComSpec || 'cmd.exe', ['/d', '/s', '/c', `start "" "${url}"`], L223: { windowsHide: true }, (error) => {

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

standalone/web-demo/server.mjsView on unpkg · L216

src/launch.jsView file

358const body = process.platform === "win32" L359: // `node` and the native harnesses are normally npm .cmd shims on Windows. cmd.exe L360: // resolves those through PATHEXT, while Node's direct spawn does not.

Findings

8 High5 Medium4 Low

HighChild Processstandalone/web-demo/server.mjs

HighShellsrc/launch.js

HighSame File Env Network Executionstandalone/web-demo/server.mjs

HighSandbox Evasion Gated Capabilitysrc/harnesses/codegpt.js

HighExternal Ai Agent Control Surface Mutationsrc/statusline.js

HighTrigger Reachable External Ai Agent Control Surface Mutationsrc/launch.js

HighSemantic Analysis Limitedsrc/mcp-register.js#virtual:normalized:round1

HighPrevious Version Dangerous Deltasrc/cli.js

MediumNetwork

MediumEnvironment Vars

MediumInstall Persistencesrc/launch.test.js

MediumShips Build Helperstandalone/claude-proxy.sh

Affected versions and remediation

This report applies to pennyrouter@0.3.37.

See all versions of pennyrouter for other recorded verdicts.

Review the evidence and your use of pennyrouter@0.3.37 before allowing it. Restrict the permissions described in this report.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.

Evidence last updated: 2026-10-11 19:04:57.927Z (UTC).

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