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@threenative/core@0.3.4: AI-agent control-surface risk | LPM Firewall

registry / @threenative/core / 0.3.4

@threenative/core@0.3.4

The small vanilla Three.js game runtime foundation.

AI Security Review

scanned 6d ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. Installing the library automatically modifies multiple foreign agent hosts’ project configurations to register executable MCP servers. This broad configuration mutation requires no affirmative consent.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

An npm installation that runs postinstall in a consumer project declaring @threenative/core, unless MCP setup is explicitly disabled.

Impact

Agent hosts acquire additional executable tools without an explicit setup decision; subsequent server launches can fetch and execute missing packages through npx.

Mechanism

The lifecycle hook calls MCP setup, which merges server commands into JSON configurations and appends missing Codex server tables.

Policy narrative

The install lifecycle selects the consuming project and automatically registers ThreeNative MCP servers across seven agent hosts. It writes agent configuration without asking for consent, although an environment variable can disable setup. The resulting configurations specify executable server commands. The launcher also supports fetching and executing missing server packages through npx. Project scoping and preservation of existing entries reduce collateral changes but do not authorize broad agent configuration mutation.

AI rationale

Inspected source establishes unconsented postinstall mutation of a broad, foreign AI-agent control surface, meeting the explicit blocking policy. Package-aligned tools and an opt-out do not supply affirmative consent.

Evidence

package.jsonscripts/postinstall.mjsscripts/ensure-mcp.mjsmcp/install.mjs

Source & flagged code

9 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

mcp/launch.mjsView file

•matchType = normalized_sha256 matchedPackage = @threenative/core@0.3.2 matchedPath = mcp/launch.mjs matchedIdentity = npm:QHRocmVlbmF0aXZlL2NvcmU:0.3.2 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.

mcp/launch.mjsView on unpkg

7* here: `threenative-engine-mcp` publishes an `exports` map with only an `import` condition, which L8: * `createRequire().resolve` refuses, and the answer we want is the directory rather than a L9: * specifier's entry point. Walking `node_modules` upward from both the project and this package

Medium

Dynamic Require

Package source references dynamic require/import behavior.

mcp/launch.mjsView on unpkg · L7

mcp/install.mjsView file

1Install-time code directly mutates a foreign AI-agent control surface: L1: import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs"; L2: import path from "node:path"; L3: import { CODEX_MCP_SERVERS, mergeMcpServers } from "./servers.mjs"; L4: ... L45: label: "Claude Code", L46: file: ".mcp.json", L47: format: "mcpServers", L48: }), L49: Object.freeze({ id: "codex", label: "Codex", file: ".codex/config.toml", format: "codex" }), L50: Object.freeze({ id: "cursor", label: "Cursor", file: ".cursor/mcp.json", format: "mcpServers" }), L51: Object.freeze({ id: "vscode", label: "VS Code", file: ".vscode/mcp.json", format: "vscode" }), ... L55: file: ".gemini/settings.json", Write operation from mcp/install.mjs: L1: import { existsSync, mkdirSync, readFileSync, writeFileSync }

Critical

Ai Agent Control Hijack

Source creates an unconsented AI-agent control surface through install-time mutation or a default unauthenticated remote skill channel.

mcp/install.mjsView on unpkg · L1

gpl/convert.pyView file

•path = gpl/convert.py kind = build_helper sizeBytes = 6997 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

gpl/convert.pyView on unpkg

gpl/fixtures/make_world_fixture.pyView file

•path = gpl/fixtures/make_world_fixture.py kind = payload_in_excluded_dir sizeBytes = 7323 magicHex = [redacted]

High

Payload In Excluded Dir

Package hides binary, compressed, or executable-looking payloads in test/fixture/hidden paths.

gpl/fixtures/make_world_fixture.pyView on unpkg

mcp/blender-server.mjs#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

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

mcp/blender-server.mjs#virtual:normalized:round1View on unpkg

mcp/blender-server.mjsView file

•matchType = previous_version_dangerous_delta matchedPackage = @threenative/core@0.3.3 matchedIdentity = npm:QHRocmVlbmF0aXZlL2NvcmU:0.3.3 similarity = 0.667 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.

mcp/blender-server.mjsView on unpkg

Source & flagged code

9 flagged

package.jsonView file

Lines 93-118json

93 "threenative-engine-mcp": "0.2.4",

94 "threenative-blender-mcp": "0.1.4"

95 },

96 "peerDependencies": {

97 "@threenative/playtest": ">=0.3.4 <0.4.0",

98 "react": ">=19.2.0 <20",

99 "react-reconciler": ">=0.33.0 <0.34"

100 },

101 "peerDependenciesMeta": {

102 "@threenative/playtest": {

103 "optional": true

104 },

105 "react": {

106 "optional": true

107 },

108 "react-reconciler": {

109 "optional": true

110 }

111 },

112 "scripts": {

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

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L113

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L113

114 "build": "node scripts/generate-version.mjs && tsup --config tsup.config.ts && node scripts/bundle-engine-mcp.mjs && node scripts/bundle-blender-mcp.mjs && publint",

115 "typecheck": "tsc --noEmit",

116 "test": "publint --strict"

117 }

118}

mcp/launch.mjsView file

Lines 1-27javascript

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

2import { existsSync, readFileSync } from "node:fs";

3import path from "node:path";

4import { fileURLToPath, pathToFileURL } from "node:url";

mcp/install.mjsView file

Lines 1-21javascript

1import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";

2import path from "node:path";

3import { CODEX_MCP_SERVERS, mergeMcpServers } from "./servers.mjs";

4

Critical

Ai Agent Control Hijack

Source creates an unconsented AI-agent control surface through install-time mutation or a default unauthenticated remote skill channel.

mcp/install.mjsView on unpkg · L1

gpl/convert.pyView file

•path = gpl/convert.py kind = build_helper sizeBytes = 6997 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

gpl/convert.pyView on unpkg

gpl/fixtures/make_world_fixture.pyView file

•path = gpl/fixtures/make_world_fixture.py kind = payload_in_excluded_dir sizeBytes = 7323 magicHex = [redacted]

High

Payload In Excluded Dir

Package hides binary, compressed, or executable-looking payloads in test/fixture/hidden paths.

gpl/fixtures/make_world_fixture.pyView on unpkg

mcp/blender-server.mjs#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

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

mcp/blender-server.mjs#virtual:normalized:round1View on unpkg

mcp/blender-server.mjsView file

•matchType = previous_version_dangerous_delta matchedPackage = @threenative/core@0.3.3 matchedIdentity = npm:QHRocmVlbmF0aXZlL2NvcmU:0.3.3 similarity = 0.667 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.

mcp/blender-server.mjsView on unpkg