create-chemx@26.9.20-1257
Chemical X Protocol: Private drop-in architecture starter kit and capsule generator
AI Security Review
scanned 11d ago · by lpm-firewall-aiThe npm postinstall hook automatically mutates project and global AI-agent control configuration without user consent. This is concrete install-time control-surface mutation, so the package should be blocked.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Installing the package through npm runs its postinstall hook.
Impact
The package adds a server entry to AI-agent control configuration, enabling those clients to invoke the package's MCP server.
Mechanism
The hook calls an installer that writes Cursor and VS Code project MCP settings and updates Antigravity's global MCP configuration without a consent prompt.
Policy narrative
During npm installation, the postinstall hook calls the MCP installer for the consumer directory. It writes server entries to project Cursor and VS Code configuration and updates the user's global Antigravity configuration if that configuration directory exists. The source shows no consent gate on this install-time path.
AI rationale
The npm postinstall hook automatically mutates project and global AI-agent control configuration without user consent. This is concrete install-time control-surface mutation, so the package should be blocked.
Evidence
package.jsoncli/postinstall.jscli/mcp/installer.js.cursor/mcp.json.vscode/mcp.json~/.gemini/config/mcp_config.json
Decision evidence
public snapshotAI identified this as a dangerous AI-agent capability at 94.0% confidence with low false-positive risk.
Evidence for policy risk
- package.json runs cli/postinstall.js during npm postinstall.
- The postinstall handler calls installAllMcpConfigs for the consumer directory without a consent check.
- That call writes MCP server configuration into project Cursor and VS Code directories and, when present, the user's global Antigravity configuration.
Evidence against
Behavioral surface
ChildProcessEnvironmentVarsFilesystemNetworkShell
HighEntropyStringsUrlStrings
Source & flagged code
10 flagged · loading sourcepackage.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 unpkgcli/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 · L27Findings
3 Critical5 High5 Medium4 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 create-chemx@26.9.20-1257.
See all versions of create-chemx for other recorded verdicts.
- Avoid installing create-chemx@26.9.20-1257. 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: .
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