registry / create-chemx / 26.10.8-344

create-chemx@26.10.8-344

Chemical X Protocol: Private drop-in architecture starter kit and capsule generator

AI Security Review

scanned 5d ago · by lpm-firewall-ai

The package automatically changes agent configuration during npm installation to expose its own MCP server, creating a concrete but package-aligned capability risk. Source inspection did not establish a broader attack, so this warrants a warning rather than a publish block.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

Installing the package through npm outside its own repository.

Impact

Agent clients may invoke the package’s MCP capabilities after installation; the automatic configuration change leaves the consumer without an installation-time choice.

Mechanism

The postinstall hook writes project-level Cursor and VS Code MCP configuration and, when an Antigravity config directory exists, registers the server in user configuration and writes tool schemas and instructions.

AI rationale

Evidence

package.jsoncli/postinstall.jscli/mcp/installer.jscli/mcp/antigravity.js.cursor/mcp.json.vscode/mcp.json~/.gemini/config/mcp_config.json~/.gemini/antigravity/mcp/chemical-x

Decision evidence

public snapshot

AI called this Suspicious at 91.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

`package.json` runs `cli/postinstall.js` on install; that script targets the consumer directory and calls the MCP installer.
The installer writes ChemX MCP entries to Cursor and VS Code project configuration and adds helper scripts to the consumer manifest.
When Antigravity’s config directory exists, installation registers the server and writes tool schemas and instructions under its user configuration.
Generated instructions describe a master tool that avoids separate approval for each sub-operation.

Evidence against

The registered command is this package’s local ChemX CLI; Antigravity setup is conditional on an existing configuration directory.
The inspected install path showed first-party MCP setup, with no unrelated script-approval grants or remote payload delivery.

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStrings

Source & flagged code

14 flagged

package.jsonView file

Lines 34-74json

34 ".": "./cli/index.js",

35 "./audit": "./cli/audit.js",

36 "./build": "./cli/build.js",

37 "./search": "./cli/search.js",

38 "./mcp": "./cli/mcp/index.js",

39 "./reader": "./cli/reader.js",

40 "./patcher": "./cli/patcher.js",

41 "./errors": "./cli/errors/index.js"

42 },

43 "scripts": {

44 "chemx": "node cli/index.js",

45 "bench": "node benchmarks/run-benchmark.mjs",

46 "ui": "node cli/index.js ui",

47 "dev:ui": "node cli/index.js ui --dev",

48 "dev:ui:watch": "node --watch --watch-path=cli cli/index.js ui --dev",

49 "test": "node --test cli/audit/*.spec.js cli/mcp/*.spec.js cli/build/*.spec.js cli/team/*.spec.js cli/errors/*.spec.js cli/*.spec.js",

50 "check:frameworks": "node scripts/check-framework-generation.mjs",

51 "prepublishOnly": "node scripts/check-framework-generation.mjs",

52 "typecheck": "tsc --noEmit",

53 "publish:both": "node scripts/publish-both.mjs",

54 "postinstall": "node cli/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L54

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L54

55 "chemx:mcp": "chemx mcp",

56 "chemx:verify": "chemx verify",

57 "chemx:test": "chemx test",

58 "chemx:typecheck": "chemx typecheck"

59 },

60 "dependencies": {

61 "@babel/parser": "^7.29.8",

62 "@babel/traverse": "^7.29.8",

63 "@babel/types": "^7.29.8",

64 "@chemx/x-atoms": "26.10.8-285"

65 },

66 "devDependencies": {

67 "@types/babel__traverse": "^7.28.0",

68 "@types/node": "^22.20.2",

69 "@types/react": "^18.3.31",

70 "@types/react-dom": "^18.3.7",

71 "@vue/test-utils": "^2.5.1",

72 "chemx": "file:.",

73 "react": "^18.3.1",

74 "react-dom": "^18.3.1",

cli/audit-preflight-git.jsView file

Lines 1-21javascript

1import fs from 'node:fs';

2import { spawnSync } from 'node:child_process';

High

Child Process

Package source references child process execution.

cli/audit-preflight-git.jsView on unpkg · L1

4const SOURCE_FILE_PATTERN = /\.

cli/build/executor.jsView file

Lines 1-31javascript

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

3export const executeBuild = (command, cwd = process.cwd(), options = {})

cli/license.jsView file

Lines 1-23javascript

1import fs from 'node:fs';

2import path from 'node:path';

3import os from 'node:os';

4import { spawnSync } from 'node:child_process';

cli/mcp/installer.jsView file

Lines 1-21javascript

1import fs from 'node:fs';

2import path from 'node:path';

3import os from 'node:os';

4import { syncAntigravityMcpSchemas } from './antigravity.js';

scripts/pre-commit.shView file

•matchType = normalized_sha256 matchedPackage = create-chemx@26.10.4-235 matchedPath = scripts/pre-commit.sh matchedIdentity = npm:Y3JlYXRlLWNoZW14:26.10.4-235 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.

scripts/pre-commit.shView on unpkg

•path = scripts/pre-commit.sh kind = build_helper sizeBytes = 8215 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

scripts/pre-commit.shView on unpkg

cli/audit/ai-slop-detector.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

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

cli/audit/ai-slop-detector.js#virtual:normalized:round1View on unpkg

cli/audit/social-git.jsView file

•matchType = normalized_sha256 matchedPackage = create-chemx@26.10.4-235 matchedPath = cli/audit/social-git.js matchedIdentity = npm:Y3JlYXRlLWNoZW14:26.10.4-235 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.

cli/audit/social-git.jsView on unpkg

cli/errors/publisher.jsView file

•matchType = normalized_sha256 matchedPackage = create-chemx@26.10.4-235 matchedPath = cli/errors/publisher.js matchedIdentity = npm:Y3JlYXRlLWNoZW14:26.10.4-235 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.

cli/errors/publisher.jsView on unpkg

cli/navigator-share.jsView file

•matchType = normalized_sha256 matchedPackage = create-chemx@26.10.4-235 matchedPath = cli/navigator-share.js matchedIdentity = npm:Y3JlYXRlLWNoZW14:26.10.4-235 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.

cli/navigator-share.jsView on unpkg

Source & flagged code

14 flagged · loading source

package.jsonView file

•scripts.postinstall = node cli/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node cli/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

cli/audit-preflight-git.jsView file

1import fs from 'node:fs'; L2: import { spawnSync } from 'node:child_process'; L3:

High

Child Process

Package source references child process execution.

cli/audit-preflight-git.jsView on unpkg · L1

Findings

1 Critical11 High5 Medium5 Low

CriticalAi Agent Control Hijackcli/mcp/installer.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processcli/audit-preflight-git.js

HighShellcli/build/executor.js

HighSame File Env Network Executioncli/license.js

HighSemantic Analysis Limitedcli/audit/ai-slop-detector.js#virtual:normalized:round1

HighKnown Malware Source Similaritycli/audit/social-git.js

HighKnown Malware Source Similaritycli/license.js

HighKnown Malware Source Similaritycli/build/executor.js

HighKnown Malware Source Similaritycli/errors/publisher.js

HighKnown Malware Source Similaritycli/navigator-share.js

Affected versions and remediation

This report applies to create-chemx@26.10.8-344.

See all versions of create-chemx for other recorded verdicts.

Review the evidence and your use of create-chemx@26.10.8-344 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.

Evidence last updated: 2026-10-18 09:10:41.946Z (UTC).

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