@chem-x/starter-kit@26.9.28-276
Chemical X Protocol: Private drop-in architecture starter kit and capsule generator
AI Security Review
scanned 11d ago · by lpm-firewall-aiThe manifest’s automatic postinstall reaches code that writes MCP configuration for the consumer project and registers this package’s server. This is unconsented install-time mutation of AI-agent control surfaces, meeting the block policy.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Installing the package through npm runs its postinstall hook.
Impact
Cursor and VS Code projects, and Antigravity’s global configuration, may gain an active MCP server entry without the consumer explicitly requesting setup.
Mechanism
The hook passes the installing project directory to an installer that creates or updates project MCP configuration and registers the package’s server command.
Policy narrative
During npm installation, the postinstall hook invokes the MCP installer for the consumer project. It writes agent configuration that makes this package’s MCP server available in supported clients, without a consent guard in the install path.
AI rationale
The manifest’s automatic postinstall reaches code that writes MCP configuration for the consumer project and registers this package’s server. This is unconsented install-time mutation of AI-agent control surfaces, meeting the block policy.
Evidence
package.jsoncli/postinstall.jscli/mcp/installer.js.cursor/mcp.json.vscode/mcp.json
Decision evidence
public snapshotAI identified this as a dangerous AI-agent capability at 98.0% confidence with low false-positive risk.
Evidence for policy risk
- The package postinstall hook runs automatically and targets the installing project directory.
- Postinstall calls an installer that registers an MCP server in project and global agent configurations.
- The installer creates or updates Cursor and VS Code MCP configuration files without a consent check.
- The server configuration points agent clients to this package’s MCP command.
Evidence against
Behavioral surface
ChildProcessEnvironmentVarsFilesystemNetworkShell
HighEntropyStringsUrlStrings
Source & flagged code
11 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 Critical6 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
HighSemantic Analysis Limitedcli/verify-lint.js#virtual:normalized:round1
MediumAmbiguous Install Lifecycle Scriptpackage.json
MediumNetwork
Medium
Affected versions and remediation
This report applies to @chem-x/starter-kit@26.9.28-276.
See all versions of @chem-x/starter-kit for other recorded verdicts.
- Avoid installing @chem-x/starter-kit@26.9.28-276. 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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