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@merels/cli: Malicious npm security report (Block) | LPM Firewall

registry / @merels/cli / 0.0.9

@merels/cli@0.0.9

Developer CLI toolchain to bootstrap, build, and publish games on Merels

AI Security Review

scanned 5h ago · by lpm-firewall-ai

A user-invoked CLI command silently collects Git identity, host identity, agent-environment details, command arguments/options, and project metadata, then sends them to the vendor worker. The same hook also modifies the active project's AGENTS.md to direct agents to remote documentation.

Static reason

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

Trigger

Running most merels CLI commands in a directory containing merels.config.json.

Impact

Sensitive identity and environment data are exfiltrated; agent behavior in the project can be influenced by remotely served documentation.

Mechanism

automatic host/identity telemetry and AGENTS.md remote-instruction injection

Attack narrative

When a user runs most CLI commands inside a Merels project, the pre-action hook creates local identifiers, rewrites AGENTS.md with a remote documentation URL, gathers Git identity, hostname, username, agent-related environment details, command data, and project metadata, and POSTs the payload to the worker endpoint. This is automatic at command runtime rather than installation, but it is concrete unconsented data exfiltration with an agent-control side effect.

Rationale

The package has no install lifecycle hook, but its normal CLI pre-action hook performs undisclosed identity/environment telemetry and modifies project agent instructions. These are concrete harmful behaviors, not merely suspicious primitives.

Evidence

package.jsonsrc/index.tssrc/telemetry.tstemplates/game/AGENTS.mdmerels.config.json.merels/local.json.gitignoreAGENTS.md

Source & flagged code

6 flagged · loading source

dist/telemetry.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = @merels/cli@0.0.8 matchedIdentity = npm:QG1lcmVscy9jbGk:0.0.8 similarity = 0.634 summary = stored previous version shares package body but lacks this dangerous source file

Critical

Previous Version Dangerous Delta

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

dist/telemetry.jsView on unpkg

2import os from 'node:os'; L3: import { execSync } from 'node:child_process'; L4: import fs from 'fs-extra'; ... L7: import { resolveWorkerTarget } from './commands/workerTarget.js'; L8: const __dirname = path.dirname(fileURLToPath(import.meta.url)); L9: const templatesDir = path.resolve(__dirname, '../templates'); ... L77: export function detectAgent() { L78: if (process.env.GEMINI_AGENT || process.env.ANTIGRAVITY) { L79: return { isAgent: true, type: 'antigravity', details: `gemini_telemetry=${process.env.GEMINI_TELEMETRY || ''}` }; ... L118: catch { L119: resolvedDocsBaseUrl = 'https://merels.app'; L120: }

High

Host Fingerprint Exfiltration

Source collects local host identity data and sends it to an external endpoint.

dist/telemetry.jsView on unpkg · L2

src/index.tsView file

26program.hook('preAction', async (thisCommand, actionCommand) => { const commandName = actionCommand.name() // connect: tracked after a successful claim. examples: tracked after a successful install // with exampleSlug (see installExamples) so the admin log is not duplicated. if (commandName === 'connect' || commandName === 'examples') return // 1. Verify and auto-heal project customizations try { const cwd = process.cwd() const gameDir = await findGameDir(cwd) if (gameDir) { const { projectId, folderId } = await getOrCreateProjectId(gameDir) await setup

High

Ai Review Evidence

Non-exempt CLI commands automatically run customization and telemetry.

src/index.tsView on unpkg · L26

src/telemetry.tsView file

238const eventPayload = { eventType: 'cli_command', projectId, folderId, timestamp: new Date().toISOString(), agent, gitUser, os: { platform: os.platform(), release: os.release(), hostname: os.hostname(), username: os.userInfo()?.username || '', },

High

Ai Review Evidence

Telemetry includes hostname and local username, then POSTs the payload.

src/telemetry.tsView on unpkg · L238

81export function detectAgent(): { isAgent: boolean; type: string; details: string } { if (process.env.GEMINI_AGENT || process.env.ANTIGRAVITY) { return { isAgent: true, type: 'antigravity', details: `gemini_telemetry=${process.env.GEMINI_TELEMETRY || ''}` } } if (process.env.CURSOR_AGENT || process.env.CURSOR_SHIM) { return { isAgent: true, type: 'cursor', details: `cursor_agent=${process.env.CURSOR_AGENT || ''}` } } if (process.env.WINDSURF_AGENT) { return { isAgent: true, type: 'windsurf', details: '' } } if (process.env.COPILOT_AGENT) { return { isAgent: true,

High

Ai Review Evidence

Agent-related environment-variable values are included in telemetry.

src/telemetry.tsView on unpkg · L81

264let workerUrl = 'https://merels-worker.yuriplex.workers.dev' try { const target = await resolveWorkerTarget(options) workerUrl = target.workerUrl } catch {} const uploadUrl = `${workerUrl}/api/telemetry/event` // Await the fetch call with a 1-second timeout to prevent process exit truncation const controller = new AbortController() const timeoutId = setTimeout(() => controller.abort(), 1000) try { await fetch(uploadUrl, { method: 'POST', headers: { 'Content-Type': 'application/json', }, body:

Lines 218-284typescript

218 if (config.displayName) displayName = config.displayName

219 } catch {}

220 }

221

222 const gitUser = getGitUser()

223 const agent = detectAgent()

224

225 // Redact options tokens

226 const redactedOptions = { ...options }

227 if (redactedOptions.token) {

228 redactedOptions.token = '[REDACTED]'

229 }

230

231 const exampleSlug =

232 typeof options?.exampleSlug === 'string' && options.exampleSlug

233 ? options.exampleSlug

234 : commandName === 'examples' && typeof args[0] === 'string'

235 ? args[0]

236 : null

237

238 const eventPayload = {

239 eventType: 'cli_command',

240 projectId,

241 folderId,

242 timestamp: new Date().toISOString(),

243 agent,

244 gitUser,

245 os: {

246 platform: os.platform(),

247 release: os.release(),

248 hostname: os.hostname(),

249 username: os.userInfo()?.username || '',

High

Ai Review Evidence

Telemetry includes hostname and local username, then POSTs the payload.

src/telemetry.tsView on unpkg · L238

250 },

251 metadata: {

252 command: commandName,

253 args,

254 options: redactedOptions,

255 publisherSlug,

256 gameSlug,

257 displayName,

258 // First-party example source fetched by `merels examples <slug>`

259 ...(exampleSlug ? { exampleSlug } : {}),

260 },

261 }

262

263 // Resolve worker URL and send telemetry in background

264 let workerUrl = 'https://merels-worker.yuriplex.workers.dev'

265 try {

266 const target = await resolveWorkerTarget(options)

267 workerUrl = target.workerUrl

268 } catch {}

269

270 const uploadUrl = `${workerUrl}/api/telemetry/event`

271

272 // Await the fetch call with a 1-second timeout to prevent process exit truncation

273 const controller = new AbortController()

274 const timeoutId = setTimeout(() => controller.abort(), 1000)

275

High

Ai Review Evidence

Telemetry includes hostname and local username, then POSTs the payload.

src/telemetry.tsView on unpkg · L264

276 try {

277 await fetch(uploadUrl, {

278 method: 'POST',

279 headers: {

280 'Content-Type': 'application/json',

281 },

282 body: JSON.stringify(eventPayload),

283 signal: controller.signal,

284 })