registry / Install hook abuse / @metaphi-ai/hum / 0.1.56

@metaphi-ai/hum@0.1.56

Hum: a self-improving coding agent for your terminal.

AI Security Review

scanned 2mo ago · by lpm-firewall-ai

This is not proven malware, but automatic curl-pipe-shell execution and a second-package installation during postinstall are unsafe install-time behavior. The inspected source does not show a complete malicious persistence, exfiltration, or broad agent-control-surface chain.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review

Trigger

npm installation runs postinstall.

Impact

Remote installer content and the fetched Python dependency execute with the installing user's permissions.

Mechanism

Downloads and pipes the uv installer to a shell, then runs uv pip install.

AI rationale

Evidence

package.jsonscripts/postinstall.jsdist/install.mjs~/.hum/engine~/.hum/engine-install.json

Network endpoints2

astral.sh/uv/install.ps1astral.sh/uv/install.sh

Decision evidence

public snapshot

AI called this Suspicious at 90.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The package runs a postinstall hook automatically.
The hook invokes the engine installer during npm installation.
The installer downloads and executes a remote shell script, then installs a Python package into the user's home directory.

Evidence against

The installed Python package is version-pinned to the npm package version by default.
The inspected JavaScript does not show browser credential harvesting or exfiltration.

Behavioral surface

Source

ChildProcessDynamicRequireEnvironmentVarsFilesystemShell

Supply chain

HighEntropyStringsUrlStrings

Manifest

NoLicense

scanned 3 file(s), 264 KB of source, external domains: astral.sh, github.com, reactjs.org

Oversized source lightweight scan

dist/cli.mjs3.60 MB file, sampled 256 KB

Source & flagged code

11 flagged

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

dist/install.mjsView file

1// src/install.js L2: import { spawnSync } from "node:child_process"; L3: import fs from "node:fs";

High

Child Process

Package source references child process execution.

dist/install.mjsView on unpkg · L1

88say("installing uv (it creates the Python environment for the part of hum that does the work) \u2026"); L89: const r = win ? runImpl("powershell", ["-ExecutionPolicy", "ByPass", "-c", "irm https://astral.sh/uv/install.ps1 | iex"], { stdio: "inherit" }) : runImpl("sh", ["-c", "curl -LsSf h... L90: u = r && r.status === 0 ? uv() : null;

High

Shell

Package source references shell execution.

dist/install.mjsView on unpkg · L88

•matchType = normalized_sha256 matchedPackage = @metaphi-ai/hum@0.1.53 matchedPath = dist/install.mjs matchedIdentity = npm:QG1ldGFwaGktYWkvaHVt:0.1.53 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.

dist/install.mjsView on unpkg

bin/hum.jsView file

8// a URL, not a path: on Windows `C:\…` is not something the ESM loader will import L9: await import(pathToFileURL(path.join(here, '..', 'dist', 'cli.mjs')).href);

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/hum.jsView on unpkg · L8

dist/cli.mjsView file

317"use strict"; L318: if (process.env.NODE_ENV !== "production") { L319: (function() { ... L545: isMounted: ["isMounted", "Instead, make sure to clean up subscriptions and pending requests in componentWillUnmount to prevent memory leaks."], L546: replaceState: ["replaceState", "Refactor your code to use setState instead (see https://github.com/facebook/react/issues/3236)."] L547: }; ... L2398: cwdFunction = isBrowser ? () => { L2399: throw new Error("`process.cwd()` only works in Node.js, not the browser."); L2400: } : process2.cwd; ... L2502: } L2503: const imageBuffer = Buffer.from(data); L2504: return wrapOsc(returnValue + `;size=${imageBuffer.byteLength}:` + imageBuffer.toString("base64") + BEL);

Critical

Browser Credential Phishing

Source appears to collect browser login credentials for exfiltration.

dist/cli.mjsView on unpkg · L317

83456import fs4 from "node:fs"; L83457: import net from "node:net"; L83458: import os5 from "node:os"; ... L83460: import crypto from "node:crypto"; L83461: import { spawn as spawn2, spawnSync as spawnSync3 } from "node:child_process"; L83462: function uvToolDirs() { L83463: const dirs = []; L83464: if (process.env.UV_TOOL_DIR) dirs.push(process.env.UV_TOOL_DIR); L83465: if (win3) {

High

Same File Env Network Execution

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

dist/cli.mjsView on unpkg · L83456

32611if (filePath && origin?.line && fs.existsSync(filePath)) { L32612: const sourceCode = fs.readFileSync(filePath, "utf8"); L32613: excerpt = dist_default3(sourceCode, origin.line); ... L65850: /* metaparameters */ L65851: "alias audit before loglevel noop require subscribe tag owner ensure group mode name|0 changes context force incl lens load_path onlyif provider returns root show_diff type_check e... L65852: ), ... L83192: // src/install.js L83193: import { spawnSync } from "node:child_process"; L83194: import fs2 from "node:fs";

Source & flagged code

11 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

dist/install.mjsView file

1// src/install.js L2: import { spawnSync } from "node:child_process"; L3: import fs from "node:fs";

High

Child Process

Package source references child process execution.

dist/install.mjsView on unpkg · L1

Findings

1 Critical8 High4 Medium5 Low

CriticalBrowser Credential Phishingdist/cli.mjs

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processdist/install.mjs

HighShelldist/install.mjs

HighSame File Env Network Executiondist/cli.mjs

HighRemote Agent Bridgedist/cli.mjs

HighKnown Malware Source Similaritydist/cli.mjs

HighKnown Malware Source Similaritydist/install.mjs

HighKnown Malware Source Fingerprint Signaturedist/cli.mjs

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumDynamic Requirebin/hum.js

MediumEnvironment Vars

Affected versions and remediation

This report applies to @metaphi-ai/hum@0.1.56.

See all versions of @metaphi-ai/hum for other recorded verdicts.

Review the evidence and your use of @metaphi-ai/hum@0.1.56 before allowing it. Restrict the permissions described in this report.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.

Evidence last updated: 2026-09-05 06:27:34.885Z (UTC).

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