@nimbus-sh/worker@0.6.0: Suspicious npm security report (Warn) | LPM Firewall

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@nimbus-sh/worker@0.6.0: Suspicious npm security report (Warn) | LPM Firewall

Decision evidence

public snapshot

AI called this Suspicious at 64.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The facet manager compiles guest JavaScript with new Function during isolated worker startup.
The Vite filesystem shim evaluates virtual-filesystem module text with new Function.
The shipped Vite asset builds functions from strings, and the HMR client fetches script text then runs it with new Function.
The Vite bundler injects that bundle into a dynamic worker through the loader binding.
The runtime ingest script, exported from package.json, downloads compiler and interpreter blobs from GitHub and the npm registry.
Generated assets such as the fifty-thousand-line Vite bundle are too large for complete static inspection, so extra hidden sinks cannot be ruled out.

Evidence against

package.json has no preinstall, install, or postinstall scripts; only a prepack build step.
The README and dist/index.js describe a Cloudflare Workers sandbox runtime, not install-time mutation of a host project.
No webhook, Discord, or other secret-exfil endpoints were found in inspectable source.
Remote URLs in the ingest script are documented clang and ruby.wasm upstreams, not anonymous drop hosts.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsEvalFilesystemNetworkShell

Supply chain

HighEntropyStringsMinifiedPossibleObfuscationTelemetryUrlStrings

ManifestNo manifest risk signals triggered.

scanned 149 file(s), 5.78 MB of source, external domains: 127.0.0.1, api.cloudflare.com, babeljs.io, busybox.net, caniuse.com, cdn.jsdelivr.net, cdn.tailwindcss.com, cloudflare-dns.com, console.opencode.ai, dash.cloudflare.com, docs.python.org, evilmartians.com, example.com, ftp.gnu.org, git-scm.com, github.com, mths.be, nimbus-cache.invalid, nimbus-internal.invalid, nimbus-runtime-cache-v2.invalid, nimbus-runtime.local, nx.dev, opencode.ai, opencode.internal, opensource.org, pnpm.io, raw.githubusercontent.com, registry.npmjs.org, rollupjs.org, rushjs.io, sheetjs.com, stackoverflow.com, tailwindcss.com, twitter.com, vercel.link, vite.dev, www.gnu.org, www.mozilla.org, www.npmjs.com, www.ruby-lang.org, www.w3.org, www.w3ctech.com, www.youtube.com, yargs.js.org

Oversized source lightweight scan

public/_assets/cirrus-plugin-react.bundle.js2.85 MB file, sampled 256 KB

FilesystemEnvironmentVarsDynamicRequireHighEntropyStringsMinifiedUrlStringsbabeljs.iogithub.com

public/_assets/opencode/1.16.2/index-attach.js13.8 MB file, sampled 256 KB

FilesystemNetworkEnvironmentVarsDynamicRequirePossibleObfuscationHighEntropyStringsMinifiedUrlStringsconsole.opencode.aiexample.comgithub.comopencode.aiopencode.internalvercel.link

Source & flagged code

15 flagged · loading source

dist/facets/manager.jsView file

184* - ASYNC OPERATIONS in flight (`__nimbusPendingOps`): a fetch, a response L185: * body read, an fs/child_process RPC. `await` resolves through L186: * PerformPromiseThen and surfaces nowhere else, so this counter is how

High

Child Process

Package source references child process execution.

dist/facets/manager.jsView on unpkg · L184

6Cross-file remote execution chain: dist/facets/manager.js spawns public/_assets/opencode/1.16.2/index.js; helper contains network access plus dynamic code execution. L6: * runaway script can't take the supervisor down. The script also needs L7: * supervisor-owned services: VFS writes, stdout/stderr, process exit, L8: * child-process brokering, and preview port routing. ... L11: * 1. LOADER.load(makeConfig) — isolated dynamic worker L12: * 2. worker.getEntrypoint().fetch() — executes the script L13: * 3. SUPERVISOR RPC — streams output and VFS writes ... L184: * - ASYNC OPERATIONS in flight (`__nimbusPendingOps`): a fetch, a response L185: * body read, an fs/child_process RPC. `await` resolves through L186: * PerformPromiseThen and surfaces nowhere els

High

Cross File Remote Execution Context

Source spawns a local helper that also contains network and dynamic execution context; review data flow before blocking.

dist/facets/manager.jsView on unpkg · L6

public/_assets/real-vite-bundle.jsView file

200exports.xxhashBase36 = xxhashBase362; L201: function xxhashBase64Url2(input) { L202: let deferred1_0; ... L545: function getRollupUrl(snippet) { L546: return `https://rollupjs.org/${snippet}`; L547: } ... L1719: params: convertNodeList(buffer[position + 4], buffer), L1720: body: convertNode(buffer[position + 5], buffer), L1721: id: null ... L2377: }, "objectPattern"), L2378: /* @__PURE__ */ __name(function privateIdentifier(position, buffer) { L2379: return {

Critical

Remote Asset Decode Execute

Source fetches a remote non-code asset, decodes its contents, and dynamically executes the decoded payload.

public/_assets/real-vite-bundle.jsView on unpkg · L200

•Remote response is passed to a worker and executed with Node capabilities. public/_assets/real-vite-bundle.js: // ── Cirrus real-vite bundler: __require2 + __require shim ─────── // 1. __cirrusRealRequireShim resolves a small whitelist of bundled // consumed by the post-patched __require2 call sites. // 2. __cirrusRealCjsRequire is a general CJS require polyfill that // works inside workerd. esbuild's built-in __require polyfill // uses `typeof require !== "undefined" ? require : throw`, which // always throws in workerd because the global `require` doesn't const _origCreateRequire = globalThis.__origCreateRequire || null; public/_assets/real-vite-bundle.js: // ── Cirrus real-vite bundler: __require2 + __require shim ─────── // 1. __cirrusRealRequireShim resolves a small whitel

Critical

Remote Response Code Execution

Source passes code obtained from a remote response into a dynamic execution sink.

public/_assets/real-vite-bundle.jsView on unpkg

69352stdio: "inherit", L69353: shell: true L69354: });

High

Shell

Package source references shell execution.

public/_assets/real-vite-bundle.js

dist/facets/real-vite-fs-shim.js#virtual:normalized:round1View file

780const subMod = { exports: {} }; L781: const subWrapped = new Function("module", "exports", "require", "__filename", "__dirname", c); L782: try { subWrapped(subMod, subMod.exports, nestedRequire, relAbs + ext, relAbs); }

High

Eval

Package source references dynamic code evaluation.

dist/facets/real-vite-fs-shim.js#virtual:normalized:round1View on unpkg · L780

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 34

High

Semantic Analysis Limited

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

dist/facets/real-vite-fs-shim.js#virtual:normalized:round1View on unpkg

dist/facets/wasm-swap-registry.js#virtual:normalized:round1View file

6* - swaps : name→name rewrite at the resolver/installer boundary. L7: * Only `compat: "drop-in"` swaps qualify (the consumer"s\n * `require()` call site works unchanged). Different-\n * require-name candidates (... L8: // `require(originalName)` call site. They are in `rejects`

Medium

Dynamic Require

Package source references dynamic require/import behavior.

dist/facets/wasm-swap-registry.js#virtual:normalized:round1View on unpkg · L6

scripts/bundle-runtime.mjs#virtual:normalized:round1View file

31* For `clang binji-2020`, the upstream is: L32: * https://raw.githubusercontent.com/binji/wasm-clang/master/{clang,lld,sysroot.tar} L33: * ... L39: * L40: * Idempotent: re-running compares sha256 with what"s currently\n * uploaded; skips re-upload on match. Re-run is safe at any time.\n *\n * Requires CLOUDFLARE_ACCOUNT_ID env var + ... L41: * Only a publish to THIS bucket may rewrite the catalog pin: the pin

High

Same File Env Network Execution

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

scripts/bundle-runtime.mjs#virtual:normalized:round1View on unpkg · L31

scripts/bundle-real-vite.mjsView file

•matchType = previous_version_dangerous_delta matchedPackage = @nimbus-sh/worker@0.4.0 matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.4.0 similarity = 0.642 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.

scripts/bundle-real-vite.mjsView on unpkg

377const installCwd = path.resolve(ROOT, '..', '..'); L378: execSync(`bun add --no-save vite@${PINNED_VITE_VERSION} @rollup/wasm-node`, { L379: cwd: installCwd, stdio: 'inherit',

High

Runtime Package Install

Package source invokes a package manager install command at runtime.

scripts/bundle-real-vite.mjsView on unpkg · L377

public/_assets/esbuild-0.24.2.wasmView file

•path = public/_assets/esbuild-0.24.2.wasm kind = wasm_module sizeBytes = 11907565 magicHex = [redacted]

Medium

Ships Wasm Module

Package ships WebAssembly modules.

public/_assets/esbuild-0.24.2.wasmView on unpkg

public/_assets/opencode/1.16.2/index-attach.jsView file

•path = public/_assets/opencode/1.16.2/index-attach.js kind = oversized_source_file sizeBytes = 14433225 magicHex = [redacted]

Medium

Oversized Source File

Package contains source files above the normal full-analysis size ceiling.

public/_assets/opencode/1.16.2/index-attach.jsView on unpkg