registry / AI-agent control-surface risk / chemx / 26.9.23-1269

chemx@26.9.23-1269

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

AI Security Review

scanned 11d ago · by lpm-firewall-ai

The package’s active postinstall hook automatically writes an MCP server registration into consumer agent configuration, a concrete unconsented install-time control-surface mutation. This meets the policy for blocking even though the inspected source does not show credential theft.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

The package’s npm postinstall hook runs during installation.

Impact

Cursor and VS Code agents can run the newly registered server after installation; Antigravity configuration is also updated when its configuration directory exists.

Mechanism

The hook calls the MCP installer, which writes the package’s server entry to consumer project configuration; the entry can launch chemx mcp through npm exec.

Policy narrative

On npm installation, the postinstall hook automatically registers the package’s MCP server in consumer agent configuration without a consent check. This enables Cursor and VS Code agents to invoke the server, and the installer can also update an existing Antigravity configuration. The source establishes an install-time control-surface mutation; it does not establish credential theft or data exfiltration.

AI rationale

Evidence

package.jsoncli/postinstall.jscli/mcp/installer.js.cursor/mcp.json.vscode/mcp.json

Decision evidence

public snapshot

AI identified this as a dangerous AI-agent capability at 96.0% confidence with low false-positive risk.

Evidence for policy risk

package.json registers cli/postinstall.js as an npm postinstall hook.
The postinstall hook automatically calls installAllMcpConfigs for the consumer directory without a consent check.
The installer writes MCP server configuration into the consumer’s .cursor/mcp.json; it also configures VS Code and conditionally Antigravity.
The configured server can invoke chemx mcp through npm exec, making the install-time configuration an active agent integration.

Evidence against

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 274 file(s), 1.41 MB of source, external domains: api.github.com, chemicalx.xophz.com, example.com, fallback.com, github.com, img.shields.io, mycompassconsulting.com, reports.chemicalx.xophz.com, www.w3.org

Source & flagged code

10 flagged

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/errors/errors.spec.jsView file

Lines 7-47javascript

7 maskSensitiveTokens,

8 normalizeHomePath,

9 sanitizeText,

10 sanitizeStackTrace

11} from './sanitizer.js';

12import {

13 buildIssueTitle,

14 buildIssueBody,

15 buildIssueWebUrl,

16 formatIssueContent

17} from './formatter.js';

18import {

19 handleError,

20 resolveTargetIssuesRepo,

21 saveIssueArtifact

22} from './catcher.js';

23import { withErrorCatcher } from './index.js';

25describe('Universal Error Catcher: Sanitizer', () => {

26 it('masks GitHub personal access tokens and npm tokens', () => {

27 const input = 'Failed with token ghp_123456789012345678901234567890123456 and npm_abcdefghijklmnopqrstuvwxyz012345';

Critical

Critical Secret

Package contains a critical-looking secret pattern.

cli/errors/errors.spec.jsView on unpkg · L27

Critical

Secret Pattern

GitHub personal access token in cli/errors/errors.spec.js

cli/errors/errors.spec.jsView on unpkg · L27

28 const sanitized = maskSensitiveTokens(input);

29 assert.ok(!sanitized.includes('ghp_1234567890'));

30 assert.ok(!sanitized.includes('npm_abcdefgh'));

31 assert.ok(sanitized.includes('[REDACTED_SECRET]'));

32 });

34 it('masks Bearer tokens and api-key parameters', () => {

35 const input = 'Authorization: Bearer mySecretToken123456789\napiKey="superSecretApiKey123"';

36 const sanitized = maskSensitiveTokens(input);

37 assert.ok(!sanitized.includes('mySecretToken123456789'));

38 assert.ok(!sanitized.includes('superSecretApiKey123'));

39 assert.ok(sanitized.includes('Bearer [REDACTED]'));

40 });

42 it('normalizes home directory paths', () => {

43 const home = os.homedir();

44 const input = `Error reading file in ${home}/my-project/index.ts`;

45 const normalized = normalizeHomePath(input);

46 assert.ok(!normalized.includes(home));

47 assert.ok(normalized.includes('~/my-project/index.ts'));

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';

cli/pillars-wizard.jsView file

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. st pick = usegum ? gumchoose(choices, 'select architectural pillars configuration') : await promptquestion('select pillars: [1=recommended, 2=strict, 3=custom, 4=minimal, 5=none] (default: 1): '); if (pick && (pick.startswith('2.') || pick === '2')) { selectedpresetkey = 'strict'; selectedpillarids = [...pillar_presets.strict.pillars]; } else if (pick && (pick.startswith('3.') || pick === '3')) { selectedpresetkey = 'custom'; for (const pillar of pillars) { const defaultchoice = pillar_presets.recommended.pillars.includes(pillar.id) ? 'y/n' : 'y/n'; const isdefaultyes = defaultchoice === 'y/n'; const answer = a

High

Trigger Reachable External Ai Agent Control Surface Mutation

Manifest-trigger-reachable source writes behavior-bearing configuration into a user or project AI-agent control surface.

cli/pillars-wizard.jsView on unpkg

scripts/pre-commit.shView file

•path = scripts/pre-commit.sh kind = build_helper sizeBytes = 4925 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

scripts/pre-commit.shView on unpkg

Source & flagged code

10 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/errors/errors.spec.jsView file

27patternName = github_pat severity = critical line = 27

Critical

Critical Secret

Package contains a critical-looking secret pattern.

cli/errors/errors.spec.jsView on unpkg · L27

Findings

3 Critical5 High5 Medium5 Low

CriticalCritical Secretcli/errors/errors.spec.js

CriticalAi Agent Control Hijackcli/mcp/installer.js

CriticalSecret Patterncli/errors/errors.spec.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processcli/audit-preflight-git.js

HighShellcli/build/executor.js

HighSame File Env Network Executioncli/license.js

HighTrigger Reachable External Ai Agent Control Surface Mutationcli/pillars-wizard.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumNetwork

MediumEnvironment Vars

MediumShips Build Helperscripts/pre-commit.sh

Affected versions and remediation

This report applies to chemx@26.9.23-1269.

See all versions of chemx for other recorded verdicts.

Avoid installing chemx@26.9.23-1269. 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: 2026-10-12 06:57:55.823Z (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

Behavioral surface

Related packages

Other AI-agent control-surface risk packages

Source & flagged code