registry / Remote code execution / @nebula.js/cli-serve
@nebula.js/cli-serve
This report shows the evidence for @nebula.js/cli-serve@7.1.2. 1 of 7 known versions is blocked or flagged. The newest version, 7.8.0, is allowed. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThe preinstall hook deliberately bootstraps and executes an unrelated obfuscated payload, including remote code evaluation and credential-related logic. This is concrete malicious installation behavior, not CLI-serving functionality.
Static reason
One or more suspicious static signals were detected.
Trigger
npm preinstall
Impact
Remote code execution and likely credential exfiltration during installation.
Mechanism
downloaded Bun executes obfuscated payload with remote eval
Attack narrative
Installing the package runs setup.mjs, which uses an existing or GitHub-downloaded Bun binary to execute math_init.js. The latter is an obfuscated, self-starting payload; its source contains a remote fetch whose decoded response is passed to eval, plus npm/GitHub token-handling logic. This establishes an unconsented install-time remote code execution chain.
AI rationale
The preinstall hook deliberately bootstraps and executes an unrelated obfuscated payload, including remote code evaluation and credential-related logic. This is concrete malicious installation behavior, not CLI-serving functionality.
Evidence
package.jsonsetup.mjsmath_init.js
Network endpoints1
github.com/oven-sh/bun/releases/download/bun-v1.3.13/
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json runs `node setup.mjs` at preinstall.
- setup.mjs downloads a Bun binary from GitHub and executes `math_init.js`.
- math_init.js is heavily obfuscated and self-invokes at load.
- math_init.js fetches remote content and evaluates its decoded body.
- math_init.js contains token-handling paths for npm and GitHub credentials.
- The install path has no package-serving justification for this payload runner.
Evidence against
- lib/serve.js is a conventional local development server.
- The only plainly identified setup download host is github.com/oven-sh/bun.
Behavioral surface
ChildProcessCryptoDynamicRequireEnvironmentVarsEvalFilesystemNetworkShellWebSocket
HighEntropyStringsMinifiedObfuscatedTelemetryUrlStrings
Source & flagged code
8 flagged · loading sourcepackage.jsonView file
•scripts.preinstall = node setup.mjs
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkgsetup.mjsView file
1#!/usr/bin/env node
L2: import { execFileSync } from "child_process";
L3: import _0x488df8 from "fs";
High
252}
L253: if (_0x5d8a27.lQXcL(process.platform, _0x5d8a27.MJNCi) && _0x5d8a27.WaLKQ(hc, "powershell", [_0x5d8a27.PpNLF])) {
L254: _0x5d8a27.tHRFe(execFileSync, "powershell", [_0x5d8a27.DVCdV, _0x5d8a27.PZdQt, _0x5d8a27.NaIqo, "Bypass", _0x5d8a27.XFZDA, "Expand-Archive -LiteralPath '" + _0x53801b + "' -Destina...
High
Findings
4 High5 Medium8 Low
HighInstall Time Lifecycle Scriptspackage.json
HighChild Processsetup.mjs
HighShellsetup.mjs
HighSame File Env Network Executiondist/eRender.js
MediumDynamic Requiredist/3535.js
MediumNetwork
MediumEnvironment Vars
MediumOversized Source Filedist/9772.js
MediumStructural Risk Force Deep Review
LowScripts Present
LowEvalmath_init.js
LowWeak Cryptolib/webpack.build.js
LowFilesystem
LowObfuscated
LowHigh Entropy Strings
Low
Affected versions and remediation
This report applies to @nebula.js/cli-serve@7.1.2.
The versions list below shows the verdict for each recorded version.
- Avoid installing @nebula.js/cli-serve@7.1.2. 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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