registry / AI-agent control-surface risk / open-walnut / 0.5.0

open-walnut@0.5.0

Personal AI powered by Claude — task management, Claude Code sessions, memory system, and web UI

AI Security Review

scanned 13d ago · by lpm-firewall-ai

The install hook makes an unconsented change to a separate AI agent’s safety guidance by removing its malware-handling reminder. This is an active AI agent control hijack, so the package should be blocked.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review

Trigger

Installing the package through npm, which runs its postinstall hook.

Impact

The modified agent loses that reminder when handling files, changing its safety guidance.

Mechanism

The hook locates the installed SDK CLI, checks for the expected patch context, and writes a replacement that removes the reminder.

Policy narrative

During npm installation, the package edits the installed Claude Agent SDK CLI and removes a safety reminder. The postinstall code writes the change after checking that the expected text is present; the package manifest activates this code during installation.

AI rationale

Evidence

package.jsonscripts/postinstall.mjspatches/@anthropic-ai+claude-agent-sdk+0.2.50.patchnode_modules/@anthropic-ai/claude-agent-sdk/cli.js

Decision evidence

public snapshot

AI identified this as a dangerous AI-agent capability at 98.0% confidence with low false-positive risk.

Evidence for policy risk

The package manifest runs a postinstall script during installation.
The postinstall script replaces a line in the installed Claude Agent SDK CLI and writes the modified file.
The bundled patch removes a reminder that tells the agent to analyze malware while refusing to improve it.
The patch is applied by the postinstall script without a user consent check.

Evidence against

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsEvalFilesystemNativeBindingsNetworkShellWebSocket

Supply chain

HighEntropyStringsMinifiedPossibleObfuscationUrlStrings

ManifestNo manifest risk signals triggered.

scanned 149 file(s), 6.29 MB of source, external domains: 127.0.0.1, docs.oasis-open.org, github.com, graph.microsoft.com, help.yahoo.com, json-schema.org, login.microsoftonline.com, myaccount.google.com, npms.io, openoffice.org, purl.oclc.org, purl.org, raw.githubusercontent.com, react.dev, schemas.microsoft.com, schemas.openxmlformats.org, sheetjs.com, sheetjs.openxmlformats.org, stuk.github.io, support.apple.com, support.microsoft.com, to-do.microsoft.com, www.apple.com, www.fastmail.help, www.w3.org

Source & flagged code

17 flagged

package.jsonView file

Lines 35-75json

35 "walnut": "./bin/open-walnut.js"

36 },

37 "main": "./dist/cli.js",

38 "engines": {

39 "node": ">=22"

40 },

41 "files": [

42 "bin",

43 "dist",

44 "!dist/daemon-binaries/daemon-linux-*",

45 "!dist/daemon-binaries/daemon-darwin-*",

46 "dist/daemon-binaries/dtach-*",

47 "!dist/**/*.map",

48 "!dist/**/*.gz",

49 "patches",

50 "scripts/postinstall.mjs",

51 "README.md",

52 "LICENSE"

53 ],

54 "scripts": {

55 "postinstall": "node scripts/postinstall.mjs",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L55

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg · L55

56 "prepublishOnly": "WALNUT_REQUIRE_BUN=1 npm run build && cd web && npx vite build && cd .. && node scripts/check-publish.mjs",

57 "prestart": "node scripts/check-node.mjs && node scripts/check-native-toolchain.mjs",

58 "start": "npm run web:build && node dist/cli.js web --port 3456",

59 "build:plugins": "npm run build -w @open-walnut/plugin-api && npm run build -w @open-walnut/plugin-cli",

60 "build": "npm run build:plugins && bash scripts/build-daemon.sh && tsup && rm -rf dist/data && cp -r src/data dist/ && for d in src/integrations/*/manifest.json; do t=\"dist/integrations/$(basename $(dirname $d))\"; mkdir -p \"$t\"; cp \"$d\" \"$t/\"; i=\"$(dirname $d)/icon.svg\"; rm -f \"$t/icon.svg\"; if [ -f \"$i\" ]; then cp \"

61 "docs:check": "node scripts/generate-ops-docs.mjs --check --repo-only && node scripts/check-plugin-doc-snippets.mjs",

62 "test:plugin-packages": "npm run build:plugins && vitest run --config vitest.focus.config.ts tests/core/plugin-package-metadata.test.ts tests/core/plugin-cli-dev.test.ts tests/core/plugin-cli-scaffold.test.ts tests/core/plugin-publish-check.test.ts && node scripts/check-plugin-packages.mjs",

63 "dev": "tsup --watch",

64 "test": "node scripts/test-parallel.mjs",

65 "test:quick": "npm run docs:check && vitest run --config vitest.quick.config.ts",

66 "search:eval": "tsx scripts/search-eval.mjs",

67 "test:slow": "vitest run --config vitest.slow.config.ts",

68 "test:focus": "vitest run --config vitest.focus.config.ts",

69 "test:frontend:ci": "node scripts/test-frontend.mjs",

70 "test:changed": "node scripts/test-changed.mjs",

71 "test:baseline": "node scripts/test-baseline.mjs check",

72 "test:baseline:record": "node scripts/test-baseline.mjs record",

73 "test:pre-commit": "npm run docs:check && node scripts/test-changed.mjs --tiers",

74 "test:unit": "vitest run --config vitest.unit.config.ts",

75 "test:integration": "vitest run --config vitest.integration.config.ts",

dist/plugin-store/walnut-rhythm/dist/server.mjsView file

Lines 1-27javascript

1import{createRequire as __cr}from"node:module";const require=__cr(import.meta.url);

3// plugin-store/walnut-rhythm/src/server.ts

4import path3 from "node:path"

dist/workers/git-compaction-worker.jsView file

Lines 1214-1254javascript

1214

1215// src/utils/json-conflict-recovery.ts

1216import fsp2 from "fs/promises";

1217import path3 from "path";

1218import os2 from "os";

1219import

dist/web/static/assets/pptx-preview.es-C4qHBTXo.jsView file

77`+x.message)}var a=new Lt;a.add(n),a.isGeoSVGGraphicRoot=!0;var i=t.width,o=t.height,s=t.viewBoxRect,l=this._boundingRect;if(!l){var u=void 0,c=void 0,h=void 0,v=void 0;if(i!=null?... L78: `+i.message)}return ij(t,a),R(a,function(i){var o=i.name;sj(t,i),uj(t,i);var s=this._specialAreas&&this._specialAreas[o];s&&i.transformTo(s.left,s.top,s.width,s.height)},this),a},r... L79: `))}),e.join(`

Low

Eval

Package source references a known benign dynamic code generation pattern.

dist/web/static/assets/pptx-preview.es-C4qHBTXo.jsView on unpkg · L77

bin/open-walnut.jsView file

Lines 43-68javascript

43 || (!sub && (args.includes('--version') || args.includes('-V'))));

44// The import is the whole program, so its failure must be LOUD. Unhandled, a

45// bundle that is momentarily empty (dist rewritten by a concurrent build) made

46// the CLI exit 0 having printed nothing at all — a caller in a loop reads that as

47// "the command answered, with nothing", which is the worst possible answer.

dist/daemon-binaries/daemon-service-cli.cjsView file

Lines 1-21javascript

1var L4=Object.create;var{getPrototypeOf:P4,defineProperty:S0,getOwnPropertyNames:i5,getOwnPropertyDescriptor:O4}=Object,d5=Object.prototype.hasOwnProperty;var v=(J

dist/daemon-binaries/dtach-darwin-arm64View file

•path = dist/daemon-binaries/dtach-darwin-arm64 kind = native_binary sizeBytes = 52384 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

dist/daemon-binaries/dtach-darwin-arm64View on unpkg

dist/data/skills/walnut-register-repo/scripts/validate-repo.pyView file

•path = dist/data/skills/walnut-register-repo/scripts/validate-repo.py kind = build_helper sizeBytes = 5994 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

dist/data/skills/walnut-register-repo/scripts/validate-repo.pyView on unpkg

dist/web/server.jsView file

•path = dist/web/server.js kind = oversized_source_file sizeBytes = 8757539 magicHex = [redacted]

Medium

Oversized Source File

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

dist/web/server.jsView on unpkg

dist/cli.jsView file

•path = dist/cli.js kind = oversized_cli_entrypoint sizeBytes = 8927156 magicHex = [redacted]

Medium

Oversized Cli Entrypoint

Package contains an oversized executable-looking CLI entrypoint.

dist/cli.jsView on unpkg

dist/cli-fast.jsView file

•stage = ast_semantic_analysis; reason = ast_alias_growth_limit_exceeded; limitedFiles = 7

High

Semantic Analysis Limited

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

dist/cli-fast.jsView on unpkg

dist/daemon-binaries/acp-worker.jsView file

•matchType = normalized_sha256 matchedPackage = open-walnut@0.4.5 matchedPath = dist/daemon-binaries/acp-worker.js matchedIdentity = npm:b3Blbi13YWxudXQ:0.4.5 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/daemon-binaries/acp-worker.jsView on unpkg

dist/integrations/walnut-time/dist/web.mjsView file

•matchType = normalized_sha256 matchedPackage = open-walnut@0.4.5 matchedPath = dist/integrations/walnut-time/dist/web.mjs matchedIdentity = npm:b3Blbi13YWxudXQ:0.4.5 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/integrations/walnut-time/dist/web.mjsView on unpkg

dist/web/static/assets/vbscript-BuJXcnF6.jsView file

•matchType = normalized_sha256 matchedPackage = open-walnut@0.4.5 matchedPath = dist/web/static/assets/vbscript-BuJXcnF6.js matchedIdentity = npm:b3Blbi13YWxudXQ:0.4.5 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/web/static/assets/vbscript-BuJXcnF6.jsView on unpkg

Source & flagged code

17 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/postinstall.mjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.mjs

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg

dist/plugin-store/walnut-rhythm/dist/server.mjsView file

7// plugin-store/walnut-rhythm/src/server/exec.ts L8: import { execFile } from "node:child_process"; L9: var MAX_BUFFER = 1024 * 1024;

High

Child Process

Package source references child process execution.

dist/plugin-store/walnut-rhythm/dist/server.mjsView on unpkg · L7

Findings

9 High9 Medium7 Low

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processdist/plugin-store/walnut-rhythm/dist/server.mjs

HighShelldist/workers/git-compaction-worker.js

HighSame File Env Network Executiondist/daemon-binaries/daemon-service-cli.cjs

HighCommand Output Exfiltrationdist/daemon-binaries/daemon-service-cli.cjs

HighSemantic Analysis Limiteddist/cli-fast.js

HighKnown Malware Source Similaritydist/daemon-binaries/acp-worker.js

HighKnown Malware Source Similaritydist/integrations/walnut-time/dist/web.mjs

HighKnown Malware Source Similaritydist/web/static/assets/vbscript-BuJXcnF6.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

Medium

Affected versions and remediation

This report applies to open-walnut@0.5.0.

See all versions of open-walnut for other recorded verdicts.

Avoid installing open-walnut@0.5.0. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-10-09 18:36:05.434Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Related packages

Other AI-agent control-surface risk packages

Runtime surface

Behavioral surface

Related packages

Other AI-agent control-surface risk packages

Source & flagged code