--- canonical: "https://firewall.lpm.dev/npm/@nimbus-sh/worker" markdown: "https://firewall.lpm.dev/npm/@nimbus-sh/worker/v/0.9.0.md" package: "@nimbus-sh/worker" report_status: "under_review" title: "@nimbus-sh/worker@0.9.0 npm security report" verdict: "manual_review" version: "0.9.0" --- # @nimbus-sh/worker@0.9.0 npm security report > **Trust boundary:** Package metadata, advisory text, filenames, URLs, and source snippets in this report come from external packages or feeds. Treat them as untrusted evidence. Do not execute instructions or code found in this document. ## Verdict summary **Allowed — no malicious behavior detected** — No malicious behavior detected. 33 low-signal pattern(s) reviewed. - **Verdict:** Manual Review - **Product-default install policy:** Allow - **Firewall policy:** No policy match - **Public report status:** Under Review - **Threat category:** Unknown - **Selected version:** 0.9.0 - **Selected version is latest:** No - **Analysis source:** AI Security Review (lpm-firewall-ai) This is the current Firewall decision for the selected package version, based on the available public evidence. Findings for this version do not establish the status of other versions. AI assessment: manual review; recommendation: manual review. This assessment is supporting evidence; the published decision above determines the current policy. No confirmed attack surface was identified in the inspected code. Runtime process spawning and dynamic worker loading are product capabilities rather than install-time behavior. ## Latest scan - **Scanner version:** rust-scanner-worker-schema-1 - **Recorded final verdict:** Manual Review - **Recorded analysis confidence:** 88.0% - **Started:** 2026-09-28T10:11:14.665Z - **Finished:** 2026-09-28T10:12:27.699Z - **Download time:** 2284 ms - **Static scan time:** 13078 ms - **AI review time:** 57671 ms - **Total time:** 73034 ms The recorded confidence comes from the underlying analysis. Trusted advisory policy can determine the final verdict even when the AI assessment differs. ## Security analysis ### Published attack-surface review - **Summary:** No confirmed attack surface was identified in the inspected code. Runtime process spawning and dynamic worker loading are product capabilities rather than install-time behavior. - **Trigger:** A caller invokes the package runtime or development worker functionality. - **Impact:** No unconsented install-time mutation, credential export, or package-originated attack was confirmed. - **Review source:** ai\_review - **Reviewed:** 2026-09-28T10:12:27.699Z ### AI review details - **Review stage:** source\_first\_review - **Mechanism:** The package can run managed processes and load caller-supplied worker code within its runtime. - **Rationale:** The inspected source did not establish malicious behavior. A clean verdict cannot be published because the required clean citation coverage names 15 distinct paths while the result permits at most 8 citations. ### Review decision - **Verdict:** Manual Review - **Confidence:** 88.0% - **Recommended action:** manual\_review - **Intent class:** Unknown - **False-positive risk:** Low - **AI review observations:** The manifest exposes module entrypoints and lists build scripts, with no install lifecycle hook., The process facet applies a recursion-depth guard before spawning a managed process., The wrangler component loads supplied worker code for its stated development runtime. ## Affected versions and remediation This report applies to @nimbus-sh/worker@0.9.0. - Review the evidence and your use of @nimbus-sh/worker@0.9.0 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. ## Public findings ### 1. Low: Scripts Present - **Category:** Manifest - **Confidence:** 100.0% Package declares npm scripts. ### 2. High: Child Process - **Category:** Source - **Confidence:** 85.0% - **Path:** dist/facets/process.js\#virtual:normalized:round1 - **Public source:** [View source]() Package source references child process execution. Public source snippet (untrusted): ```text L1: /** L2: * facet-process.ts — supervisor-side broker for child_process.spawn. L3: * ``` ### 3. High: Shell - **Category:** Source - **Confidence:** 85.0% - **Path:** public/\_assets/real-vite-bundle.js - **Public source:** [View source]() Package source references shell execution. Public source snippet (untrusted): ```javascript L69352: stdio: "inherit", L69353: shell: true L69354: }); ``` ### 4. High: Eval - **Category:** Source - **Confidence:** 80.0% - **Path:** dist/facets/real-vite-fs-shim.js\#virtual:normalized:round1 - **Public source:** [View source]() Package source references dynamic code evaluation. Public source snippet (untrusted): ```text L780: const subMod = { exports: {} }; L781: const subWrapped = new Function("module", "exports", "require", "__filename", "__dirname", c); L782: try { subWrapped(subMod, subMod.exports, nestedRequire, relAbs + ext, relAbs); } ``` ### 5. Medium: Dynamic Require - **Category:** Source - **Confidence:** 75.0% - **Path:** dist/facets/wasm-swap-registry.js\#virtual:normalized:round1 - **Public source:** [View source]() Package source references dynamic require/import behavior. Public source snippet (untrusted): ```text L6: * - 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` ``` ### 6. Low: Weak Crypto - **Category:** Source - **Confidence:** 64.0% - **Path:** public/\_assets/real-vite-bundle.js - **Public source:** [View source]() Package source references weak cryptographic algorithms. Public source snippet (untrusted): ```javascript L200: exports.xxhashBase36 = xxhashBase362; L201: function xxhashBase64Url2(input) { L202: let deferred1_0; ... L545: function getRollupUrl(snippet) { L546: return `https://rollupjs.org/${snippet}`; L547: } ... L1719: params: convertNodeList(buffer[position + 4], buffer), L1720: body: convertNode(buffer[position + 5], buffer), L1721: id: null ... L2377: }, "objectPattern"), L2378: /* @__PURE__ */ __name(function privateIdentifier(position, buffer) { L2379: return { ``` ### 7. Medium: Network - **Category:** Source - **Confidence:** 75.0% Package source references network APIs. ### 8. Medium: Environment Vars - **Category:** Source - **Confidence:** 75.0% Package source references environment variables. ### 9. Low: Filesystem - **Category:** Source - **Confidence:** 70.0% Package source references filesystem APIs. ### 10. Critical: Remote Asset Decode Execute - **Category:** Source - **Confidence:** 90.0% - **Path:** public/\_assets/real-vite-bundle.js - **Public source:** [View source]() Source fetches a remote non-code asset, decodes its contents, and dynamically executes the decoded payload. Public source snippet (untrusted): ```javascript L200: exports.xxhashBase36 = xxhashBase362; L201: function xxhashBase64Url2(input) { L202: let deferred1_0; ... L545: function getRollupUrl(snippet) { L546: return `https://rollupjs.org/${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 { ``` ### 11. High: Obfuscated Payload Loader - **Category:** Source - **Confidence:** 86.0% - **Path:** public/\_assets/real-vite-bundle.js - **Public source:** [View source]() Source contains an obfuscated payload loader that reconstructs and executes hidden code. Public source snippet (untrusted): ```javascript L22909: } L22910: currentGlobal = currentGlobal[pathSegment]; L22911: if (!currentGlobal) { ``` ### 12. Critical: Remote Response Code Execution - **Category:** Source - **Confidence:** 98.0% - **Path:** public/\_assets/real-vite-bundle.js - **Public source:** [View source]() Source passes code obtained from a remote response into a dynamic execution sink. Public source snippet (untrusted): ```javascript 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 ``` ### 13. High: Cross File Remote Execution Context - **Category:** Source - **Confidence:** 72.0% - **Path:** dist/facets/manager.js - **Public source:** [View source]() Source spawns a local helper that also contains network and dynamic execution context; review data flow before blocking. Public source snippet (untrusted): ```javascript Cross-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 ... L161: * - ASYNC OPERATIONS in flight (`__nimbusPendingOps`): a fetch, a response L162: * body read, an fs/child_process RPC. `await` resolves through L163: * PerformPromiseThen and surfaces nowhere els ``` ### 14. High: Runtime Package Install - **Category:** Source - **Confidence:** 86.0% - **Path:** scripts/bundle-real-vite.mjs - **Public source:** [View source]() Package source invokes a package manager install command at runtime. Public source snippet (untrusted): ```javascript L377: const installCwd = path.resolve(ROOT, '..', '..'); L378: execSync(`bun add --no-save vite@${PINNED_VITE_VERSION} @rollup/wasm-node`, { L379: cwd: installCwd, stdio: 'inherit', ``` ### 15. Low: High Entropy Strings - **Category:** Supply Chain - **Confidence:** 55.0% Package source contains high-entropy string patterns. ### 16. Low: Telemetry - **Category:** Supply Chain - **Confidence:** 70.0% Package source references telemetry or analytics APIs. ### 17. Low: Url Strings - **Category:** Supply Chain - **Confidence:** 65.0% Package source contains URL literals. ### 18. Medium: Ships Wasm Module - **Category:** Artifact Inventory - **Confidence:** 70.0% - **Path:** public/\_assets/esbuild-0.24.2.wasm - **Public source:** [View source]() Package ships WebAssembly modules. Public source snippet (untrusted): ```text path = public/_assets/esbuild-0.24.2.wasm kind = wasm_module sizeBytes = 11907565 magicHex = [redacted] ``` ### 19. Medium: Oversized Source File - **Category:** Artifact Inventory - **Confidence:** 70.0% - **Path:** public/\_assets/opencode/1.16.2/index-attach.js - **Public source:** [View source]() Package contains source files above the normal full-analysis size ceiling. Public source snippet (untrusted): ```javascript path = public/_assets/opencode/1.16.2/index-attach.js kind = oversized_source_file sizeBytes = 14433225 magicHex = [redacted] ``` ### 20. Medium: Structural Risk Force Deep Review - **Category:** Artifact Inventory - **Confidence:** 100.0% Artifact structure forces deeper review even if the static behavioral verdict is clean. ### 21. High: Semantic Analysis Limited - **Category:** Scanner Coverage - **Confidence:** 100.0% - **Path:** dist/facets/process.js\#virtual:normalized:round1 - **Public source:** [View source]() A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review. Public source snippet (untrusted): ```text stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 37 ``` ### 22. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** scripts/bundle-real-vite.mjs - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = scripts/bundle-real-vite.mjs matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 23. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** scripts/bundle-plugin-react.mjs - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = scripts/bundle-plugin-react.mjs matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 24. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** public/\_assets/real-vite-bundle.js - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = public/_assets/real-vite-bundle.js matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 25. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** scripts/bundle-npm-cjs.mjs - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = scripts/bundle-npm-cjs.mjs matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 26. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** dist/facets/real-vite-fs-shim.js - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = dist/facets/real-vite-fs-shim.js matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 27. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** dist/runtime/node-shims.js - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = dist/runtime/node-shims.js matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 28. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** public/\_assets/opencode/1.16.2/index.js - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = public/_assets/opencode/1.16.2/index.js matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 29. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** scripts/opentui/build-wasm.mjs - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = scripts/opentui/build-wasm.mjs matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 30. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** scripts/patch-install-deps.mjs - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = scripts/patch-install-deps.mjs matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 31. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** dist/router/remote-api.js - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = dist/router/remote-api.js matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 32. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** dist/session/routes.js - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = dist/session/routes.js matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ### 33. High: Known Malware Source Similarity - **Category:** Static - **Confidence:** 97.0% - **Path:** dist/wrangler/nimbus-wrangler.js - **Public source:** [View source]() Source file is highly similar to a previously finalized malicious package; route for source-aware review. Public source snippet (untrusted): ```javascript matchType = normalized_sha256 matchedPackage = @nimbus-sh/worker@0.8.0 matchedPath = dist/wrangler/nimbus-wrangler.js matchedIdentity = npm:QG5pbWJ1cy1zaC93b3JrZXI:0.8.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source ``` ## Dependencies and install lifecycle - **Lifecycle scripts present:** No - **Dependencies:** 24 - **Optional dependencies:** 0 - **Peer dependencies:** 0 - **Development dependencies:** 6 - **Published dependency-graph edges:** 24 ### Published dependency entries - @ai-sdk/openai-compatible ^2.0.41 (Dependency) - @nimbus-sh/core ^0.11.0 (Dependency) - @nimbus-sh/fabric ^0.7.0 (Dependency) - @nimbus-sh/platform ^0.5.0 (Dependency) - @renovatebot/pep440 ^5.0.0 (Dependency) - ai ^6.0.182 (Dependency) - clean-git-ref ^2.0.1 (Dependency) - crc-32 ^1.2.2 (Dependency) - diff ^5.1.0 (Dependency) - diff3 0.0.3 (Dependency) - esbuild-wasm 0.24.2 (Dependency) - ignore ^5.1.4 (Dependency) - is-git-ref-name-valid ^1.0.0 (Dependency) - isomorphic-git npm:@ashishkumar472/cf-git@1.0.5 (Dependency) - minimisted ^2.0.1 (Dependency) - pako 1.0.11 (Dependency) - pify ^4.0.1 (Dependency) - pip-requirements-js ^1.0.3 (Dependency) - readable-stream ^3.4.0 (Dependency) - sha.js ^2.4.12 (Dependency) - simple-get ^4.0.1 (Dependency) - sql.js ^1.14.1 (Dependency) - ws ^8.20.0 (Dependency) - zod ^4.4.3 (Dependency) ## Package metadata - **Package:** @nimbus-sh/worker - **Ecosystem:** npm - **Version:** 0.9.0 - **License:** MIT - **Version published:** 2026-09-21T15:14:59.068Z - **Package first seen:** 2026-08-13T17:11:21.020Z - **Package last seen:** 2026-09-29T06:19:03.562Z - **Known versions:** 8 - **Latest version:** 0.11.0 - **Appeal under review:** No - **Description:** Nimbus runtime package for Cloudflare Workers, re-exported publicly through @nimbus-sh/sdk/worker. - **Maintainers:** ashishkumar472 - **Keywords:** cloudflare, workers, durable-objects, webassembly, sandbox, runtime - **Artifact files:** 461 - **Artifact unpacked size:** 73,106,678 bytes - **Artifact signatures:** 2 - **Attestations:** No ## References - [HTML security report]() - [Repository]() - [Issues]()