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@jenga-ai/agent@4.1.0: Malicious npm security report (Block) | LPM Firewall

registry / @jenga-ai/agent / 4.1.0

@jenga-ai/agent@4.1.0

An agentic development workflow for Claude Code, Copilot, and Codex — with a persistent Epic/Story/Task board, an isolated git worktree per task, and a separate tester agent that runs your test suite before anything is marked done.

AI Security Review

scanned 9d ago · by lpm-firewall-ai

An automatic npm installation hook changes consumer AI-agent discovery and control locations. It installs package content into Claude and generic agent directories, creates Copilot instructions, and configures package shell scripts as Copilot lifecycle hooks.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

Installing the package through npm runs the post-install hook without an interactive setup command.

Impact

A package installation can alter how AI coding agents load instructions and execute lifecycle hooks in the consumer project.

Mechanism

The hook mirrors package files into consumer agent directories and writes Copilot configuration that invokes package-resident shell scripts on agent events.

Attack narrative

During npm installation, the package automatically populates consumer AI-agent discovery directories and creates Copilot project configuration. The generated configuration associates prompt and session lifecycle events with shell scripts from the installed package. These changes occur before the user runs the explicit setup command and modify broad agent control surfaces in the consumer project.

AI rationale

The automatic post-install chain mutates foreign AI-agent configuration and installs executable lifecycle hooks without interactive consent. This is concrete install-hook abuse under the stated policy, despite no inspected evidence of network exfiltration.

Evidence

package.jsonscripts/postinstall.jslib/generate-copilot-hooks.js.claude.agents.github/copilot-instructions.md

Source & flagged code

18 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

mcp/training_runner/index.jsView file

15import { join, resolve } from "path"; L16: import { spawn } from "child_process"; L17: import { load as yamlLoad } from "js-yaml";

High

Child Process

Package source references child process execution.

mcp/training_runner/index.jsView on unpkg · L15

•matchType = normalized_sha256 matchedPackage = @jenga-ai/agent@4.0.0 matchedPath = mcp/training_runner/index.js matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:4.0.0 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.

mcp/training_runner/index.jsView on unpkg

project/app/ui/scripts/build-snapshot-html.cjsView file

•matchType = normalized_sha256 matchedPackage = @jenga-ai/agent@4.0.0 matchedPath = project/app/ui/scripts/build-snapshot-html.cjs matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:4.0.0 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.

project/app/ui/scripts/build-snapshot-html.cjsView on unpkg

46L47: const fs = require('fs'); L48: const path = require('path');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

project/app/ui/scripts/build-snapshot-html.cjsView on unpkg · L46

project/app/ui/scripts/dashboard-open.cjsView file

16L17: const http = require('http'); L18: const { execFile } = require('child_process'); L19: ... L22: L23: let port = parseInt(process.env.JENGA_API_PORT || '3001', 10); L24:

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

project/app/ui/scripts/dashboard-open.cjsView on unpkg · L16

•matchType = normalized_sha256 matchedPackage = @jenga-ai/agent@4.0.0 matchedPath = [redacted]-open.cjs matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:4.0.0 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.

project/app/ui/scripts/dashboard-open.cjsView on unpkg

•matchType = previous_version_dangerous_delta matchedPackage = @jenga-ai/agent@3.2.0 matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:3.2.0 similarity = 0.475 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

project/app/ui/scripts/dashboard-open.cjs

scripts/postinstall.jsView file

6* Copies the discovery-bound dirs — `skills/` and `agents/` — into BOTH L7: * `<consumer>/.claude/` (where Claude Code looks) and `<consumer>/.agents/` L8: * (where non-Claude agents like Copilot / custom look, per the framework's ... L40: * Location : one manifest per destination root, inside that root — L41: * <consumer>/.agents/.jenga-postinstall-manifest.json L42: * <consumer>/.claude/.jenga-postinstall-manifest.json L43: * Keeping it inside the root it describes means it travels with that ... L50: * "generated_at": "<ISO 8601>", L51: * "dest_root": ".agents", L52: * "paths": ["agents/developer.md", "skills/j-do/SKILL.md"] ... L203: L204: // Discovery-bound dirs get mirr

Critical

Ai Agent Control Hijack

Source creates an unconsented AI-agent control surface through install-time mutation or a default unauthenticated remote skill channel.

scripts/postinstall.jsView on unpkg · L6

lib/commands/init.jsView file

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. const __dirname = dirname(fileurltopath(import.meta.url)); const package_root = join(__dirname, "..", ".."); async function prompt(rl, question, defaultvalue) { return new promise(resolve => { const hint = defaultvalue !== undefined ? ` (default: ${defaultvalue})` : ""; rl.question(`${question}${hint}: `, answer => { resolve(answer.trim() || string(defaultvalue ?? "")); }); }); } export async function runinit(args, projectroot = process.cwd()) { const configpath = join(projectroot, config_file); let existing = {}; if (existssync(configpath)) { try { existing = json.parse(readfilesyn

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.

lib/commands/init.jsView on unpkg

hooks/on_session_end.shView file

•path = hooks/on_session_end.sh kind = build_helper sizeBytes = 20765 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

hooks/on_session_end.shView on unpkg

project/app/api/parsers/todo.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.

project/app/api/parsers/todo.js#virtual:normalized:round1View on unpkg

project/app/ui/scripts/dashboard-start.cjsView file

•matchType = normalized_sha256 matchedPackage = @jenga-ai/agent@4.0.0 matchedPath = [redacted]-start.cjs matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:4.0.0 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.

project/app/ui/scripts/dashboard-start.cjsView on unpkg

lib/commands/dashboard.jsView file

•matchType = normalized_sha256 matchedPackage = @jenga-ai/agent@4.0.0 matchedPath = lib/commands/dashboard.js matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:4.0.0 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.

lib/commands/dashboard.jsView on unpkg

project/app/api/parsers/architecture.jsView file

•matchType = normalized_sha256 matchedPackage = @jenga-ai/agent@4.0.0 matchedPath = [redacted].js matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:4.0.0 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.

project/app/api/parsers/architecture.jsView on unpkg

skills/j-publish/scripts/npm_stage_pipeline.shView file

•matchType = normalized_sha256 matchedPackage = @jenga-ai/agent@4.0.0 matchedPath = skills/j-publish/scripts/npm[redacted] matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:4.0.0 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.

skills/j-publish/scripts/npm_stage_pipeline.shView on unpkg

skills/j-uncharted/scripts/import-source.shView file

•matchType = normalized_sha256 matchedPackage = @jenga-ai/agent@4.0.0 matchedPath = skills/j-uncharted/scripts/import-source.sh matchedIdentity = npm:QGplbmdhLWFpL2FnZW50:4.0.0 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.

skills/j-uncharted/scripts/import-source.shView on unpkg