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yaver-cli@1.99.458: Malicious npm security report (Block) | LPM Firewall

registry / yaver-cli / 1.99.458

yaver-cli@1.99.458

Unified npm bootstrap for the Yaver agent, SDK injection, and local-first developer runtime

AI Security Review

scanned 1mo ago · by lpm-firewall-ai

A global npm installation automatically installs and reconfigures third-party AI coding runners. It also downloads and runs a native agent and, as root on Linux, weakens host namespace restrictions.

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

npm global installation of yaver-cli, unless an opt-out environment variable is supplied.

Impact

A package installation can alter Codex, Claude Code, and OpenCode control surfaces and materially change the host without an explicit setup command.

Mechanism

Postinstall-driven third-party runner installation, MCP registration, native-agent execution, and host configuration changes.

Attack narrative

Installing this package globally runs its postinstall hook. If no supported coding runner is present, it globally installs Claude Code, Codex, and OpenCode, then invokes its downloaded Yaver agent to register an MCP server in detected runners. The same hook writes shell startup files and can, when run as root on Linux, enable unprivileged user namespaces and relax AppArmor restrictions. The agent binary is selected from remote release metadata, cached, made executable, and run during this automatic lifecycle path.

AI rationale

The postinstall hook makes unconsented, broad changes to foreign AI-agent control surfaces and the host. This meets the install-hook abuse blocking policy despite its global-install guard and opt-outs.

Evidence

package.jsonsrc/postinstall.jssrc/agent-runtime.js~/.yaver/bin~/.bashrc~/.zshrc~/.profile~/.zshenv

Source & flagged code

21 flagged · loading source

package.jsonView file

•scripts.postinstall = node src/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 4

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

•scripts.postinstall = node src/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

src/hermesc-runtime.jsView file

24const https = require("https"); L25: const { spawnSync } = require("child_process"); L26:

High

Child Process

Package source references child process execution.

src/hermesc-runtime.jsView on unpkg · L24

23const path = require("path"); L24: const https = require("https"); L25: const { spawnSync } = require("child_process"); L26: L27: const HERMES_RN_VERSION = process.env.YAVER_HERMES_RN_VERSION || "0.81.5"; L28:

High

Same File Env Network Execution

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

src/hermesc-runtime.jsView on unpkg · L23

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/hermesc-runtime.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 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.

src/hermesc-runtime.jsView on unpkg

src/postinstall.jsView file

554// runners are ordinary npm globals and must not disappear merely because L555: // the install came from PowerShell. L556: if (!envEnabled("YAVER_SKIP_POSTINSTALL_RUNNERS")) {

High

Shell

Package source references shell execution.

src/postinstall.jsView on unpkg · L554

10Trigger-reachable persistence chain: scripts.postinstall -> src/postinstall.js L10: const { ensureHermesc } = require("./hermesc-runtime"); L11: const { execFileSync, execSync, spawnSync } = require("child_process"); L12: const fs = require("fs"); ... L29: function envEnabled(name) { L30: const raw = String(process.env[name] || "").trim().toLowerCase(); L31: return raw === "1" || raw === "true" || raw === "yes"; ... L49: function commandExists(name) { L50: const probe = process.platform === "win32" L51: ? spawnSync("where.exe", [name], { stdio: "ignore", windowsHide: true }) L52: : spawnSync("/bin/sh", ["-c", `command -v ${name}`], { stdio: "ignore" }); L53: return !probe.error && probe.status === 0; ... L321:

High

Trigger Reachable Persistence

A manifest entrypoint or package-local install chain reaches persistence behavior.

src/postinstall.jsView on unpkg · L10

150if (typeof process.geteuid !== "function" || process.geteuid() !== 0) { L151: log("linux/arm64 hermesc build needs cmake/ninja/clang/libicu-dev — re-run `npm install -g yaver-cli` as root to provision them, or install manually."); L152: return; ... L158: } L159: execSync("apt-get update -y", { stdio: ["ignore", "ignore", "ignore"] }); L160: execSync(`DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends ${required.join(" ")}`, {

High

src/analyzer.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/analyzer.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 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.

src/analyzer.jsView on unpkg

1const fs = require('fs'); L2: const semver = require('semver');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

src/analyzer.jsView on unpkg · L1

src/commands/desktop.jsView file

15const fs = require("node:fs"); L16: const https = require("node:https"); L17: const os = require("node:os"); L18: const path = require("node:path"); L19: const { spawn, spawnSync } = require("node:child_process"); L20: const { pipeline } = require("node:stream/promises"); ... L50: L51: function normalizedArch(arch = process.arch) { L52: if (arch === "x64" || arch === "amd64") return "x64"; ... L95: L96: function installedDesktopCandidates(platform = process.platform, env = process.env, home = os.homedir()) { L97: if (platform === "darwin") {

Critical

Download Execute

Source downloads or fetches remote code and executes it.

src/commands/desktop.jsView on unpkg · L15

15Trigger-reachable chain: scripts.postinstall -> src/postinstall.js -> src/commands/desktop.js L15: const fs = require("node:fs"); L16: const https = require("node:https"); L17: const os = require("node:os"); L18: const path = require("node:path"); L19: const { spawn, spawnSync } = require("node:child_process"); L20: const { pipeline } = require("node:stream/promises"); ... L50: L51: function normalizedArch(arch = process.arch) { L52: if (arch === "x64" || arch === "amd64") return "x64"; ... L95: L96: function installedDesktopCandidates(platform = process.platform, env = process.env, home = os.homedir()) { L97: if (platform === "darwin") {

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

src/commands/desktop.jsView on unpkg · L15

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/commands/desktop.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 similarity = 1.000 summary = normalized source hash matched finalized malicious source

hermesc/darwin-x64/hermescView file

•path = hermesc/darwin-x64/hermesc kind = native_binary sizeBytes = 6297624 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

hermesc/darwin-x64/hermescView on unpkg

src/commands/run.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/commands/run.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 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.

src/commands/run.jsView on unpkg

src/update-check.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/update-check.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 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.

src/update-check.jsView on unpkg

src/transport.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/transport.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 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.

src/transport.jsView on unpkg

src/agent-runtime.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = yaver-cli@1.99.332 matchedIdentity = npm:eWF2ZXItY2xp:1.99.332 similarity = 0.810 summary = stored previous version shares package body but lacks this dangerous source file

Critical

Previous Version Dangerous Delta

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

src/agent-runtime.jsView on unpkg

Source & flagged code

21 flagged

package.jsonView file

Lines 1-35json

1{

2 "name": "yaver-cli",

3 "version": "1.99.458",

4 "mcpName": "io.github.yaver-io/yaver",

5 "description": "Unified npm bootstrap for the Yaver agent, SDK injection, and local-first developer runtime",

6 "bin": {

7 "yaver": "bin/yaver",

8 "yaver-push": "bin/yaver-push",

9 "yaver-mcp": "bin/yaver-mcp",

10 "yaver-cli": "bin/yaver-mcp"

11 },

12 "main": "src/index.js",

13 "scripts": {

14 "test": "node --test test/*.test.js",

15 "postinstall": "node src/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L15

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L15

16 "preuninstall": "node src/preuninstall.js"

17 },

18 "files": [

19 "bin/",

20 "src/",

21 "hermesc/",

22 "sdk-manifest.json"

23 ],

24 "keywords": [

25 "mcp",

26 "mcp-server",

27 "model-context-protocol",

28 "claude-code",

29 "codex",

30 "ai-agent",

31 "developer-tools",

32 "local-first",

33 "react-native",

34 "testing",

35 "mobile",

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 4

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

src/hermesc-runtime.jsView file

Lines 3-44javascript

3// Runs from `postinstall` on global installs and on-demand from the

4// bundler. Avoids shipping a ~6 MB binary inside the tarball that's

5// only correct for one platform — instead we detect the host and

6// install a matching hermesc at install time.

7//

8// Lookup order (redundant by design; any one succeeding is enough):

9// 1. Cached install under node_modules/yaver-cli/hermesc/<key>/hermesc

10// 2. Per-user cache under ~/.yaver/hermesc/<key>/hermesc

11// 3. Download from the react-native npm tarball and extract just

12// sdks/hermesc/<rn-dir>/hermesc for this platform

src/postinstall.jsView file

Lines 1-30javascript

1#!/usr/bin/env node

2// npm postinstall hook — prefetch the Yaver agent and provision the

3// Yaver-managed Hermes reload stack on global installs so a fresh

4// Linux/WSL/macOS box can get to headless auth + Open in Yaver

5// without an extra `yaver install mobile` step.

6//

7// Must NEVER fail npm install. This is best-effort bootstrap only.

8

9const { ensureAgentBinary, runAgentCommand } =

src/analyzer.jsView file

Lines 1-21javascript

1const fs = require('fs');

2const semver = require('semver');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

src/analyzer.jsView on unpkg · L1

3

4

src/commands/desktop.jsView file

Lines 1-35javascript

1"use strict";

2

3/**

4 * Optional native desktop companion for the unified npm CLI.

5 *

6 * The npm package intentionally does not contain Electron itself. `yaver

7 * desktop install` downloads the architecture-specific canonical `electron/`

8 * release, verifies the release checksum, verifies the OS signature where the

9 * host provides one, and installs per-user. The Go agent remains independently

10 * usable through the console and an already-running agent is adopted by the

hermesc/darwin-x64/hermescView file

•path = hermesc/darwin-x64/hermesc kind = native_binary sizeBytes = 6297624 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

hermesc/darwin-x64/hermescView on unpkg

src/commands/run.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/commands/run.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 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.

src/commands/run.jsView on unpkg

src/update-check.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/update-check.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 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.

src/update-check.jsView on unpkg

src/transport.jsView file

•matchType = normalized_sha256 matchedPackage = yaver-cli@1.99.436 matchedPath = src/transport.js matchedIdentity = npm:eWF2ZXItY2xp:1.99.436 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.

src/transport.jsView on unpkg

src/agent-runtime.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = yaver-cli@1.99.332 matchedIdentity = npm:eWF2ZXItY2xp:1.99.332 similarity = 0.810 summary = stored previous version shares package body but lacks this dangerous source file

Critical

Previous Version Dangerous Delta

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

src/agent-runtime.jsView on unpkg