schematic-pg@0.5.0
Single-file backend framework for PostgreSQL and Node.js
AI Security Review
scanned 13d ago · by lpm-firewall-aiThe package has an active npm postinstall path that unconsentedly overwrites a consumer project's existing AI agent instruction file. This is a concrete AI agent control hijack, so publication should be blocked.
Static reason
One or more suspicious static signals were detected.
Trigger
Installing or updating schematic-pg through npm when INIT_CWD points to a consumer project containing AGENTS.md.
Impact
This can replace project-specific AI agent instructions and change the guidance available to agents working in that project.
Mechanism
The hook resolves INIT_CWD and overwrites AGENTS.md with generated package content without requesting consent.
Policy narrative
During npm postinstall, the package uses INIT_CWD to find the consumer project. If that project already has AGENTS.md, the hook writes the package guide over it without asking first, replacing the project's AI agent instructions.
AI rationale
The package has an active npm postinstall path that unconsentedly overwrites a consumer project's existing AI agent instruction file. This is a concrete AI agent control hijack, so publication should be blocked.
Evidence
package.jsonscripts/postinstall.mjsdist/cli/postinstall.jsdist/cli/sync-agents.jsdist/cli/templates/agents.md<consumer project>/AGENTS.md
Decision evidence
public snapshotAI identified this as a dangerous AI-agent capability at 97.0% confidence with low false-positive risk.
Evidence for policy risk
- package.json runs scripts/postinstall.mjs during npm postinstall.
- The postinstall script imports and executes the compiled postinstall module.
- The hook uses INIT_CWD to locate the consumer project, then replaces its existing AGENTS.md with the package guide without a consent check.
- The destination is an AI agent instruction file, and the package guide says it is replaced on install or update.
Evidence against
Behavioral surface
ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemShell
HighEntropyStringsUrlStrings
Source & flagged code
6 flagged · loading sourcepackage.jsonView file
•scripts.postinstall = node scripts/postinstall.mjs
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkg51"scripts": {
"postinstall": "node scripts/postinstall.mjs",
"build": "tsc -p tsconfig.build.json && mkdir -p dist/cli/templates &&
High
Suspicious Lifecycle Evidence
package.json runs scripts/postinstall.mjs during npm postinstall.
package.jsonView on unpkg · L51•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 unpkgdist/constants.jsView file
Findings
4 High4 Medium4 Low
HighInstall Time Lifecycle Scriptspackage.json
HighSuspicious Lifecycle Evidencepackage.json
HighSuspicious Lifecycle Evidencescripts/postinstall.mjs
HighSuspicious Lifecycle Evidencedist/cli/postinstall.js
MediumAmbiguous Install Lifecycle Scriptpackage.json
MediumDynamic Requiredist/constants.js
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowScripts Present
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to schematic-pg@0.5.0.
See all versions of schematic-pg for other recorded verdicts.
- Avoid installing schematic-pg@0.5.0. 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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