registry / Remote code execution / helmet-pro

helmet-pro

This report shows the evidence for helmet-pro@10.0.4, the only known version.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

Direct source inspection confirms a concealed postinstall remote payload loader and arbitrary dynamic execution. This is concrete malicious install-time behavior.

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

Impact

Remote operator can execute arbitrary code with the installing user's privileges.

Mechanism

obfuscated remote payload download followed by new Function execution

Attack narrative

Installation invokes lib/utils/index.js, which silently detaches a child Node process to run an unrelated, obfuscated loader. The loader downloads a JSONBin record and compiles its cookie field with new Function, supplying require to the fetched code. This creates an install-time remote-code-execution channel independent of the package's stated SMTP functionality.

AI rationale

Direct source inspection confirms a concealed postinstall remote payload loader and arbitrary dynamic execution. This is concrete malicious install-time behavior.

Evidence

package.jsonlib/utils/index.jslib/utils/smtp-connection/index.js

Network endpoints1

api.jsonbin.io/v3/b/6a719632da38895dfeb7128d

Decision evidence

public snapshot

AI called this Malicious at 99.0% confidence as Malware with low false-positive risk.

Evidence for block

package.json defines postinstall: node lib/utils/index.js.
lib/utils/index.js spawns lib/utils/smtp-connection/index.js detached during install.
The spawned file is obfuscated and fetches https://api.jsonbin.io/v3/b/6a719632da38895dfeb7128d.
It passes remote record.cookie to new Function(...)(require), enabling arbitrary code execution.

Evidence against

lib/nodemailer.js and lib/smtp-connection/index.js appear to contain normal mail/SMTP functionality.
No credential harvesting or local-file exfiltration was confirmed in the inspected loader.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsEvalFilesystemNetwork

Supply chain

HighEntropyStringsObfuscatedUrlStrings

ManifestNo manifest risk signals triggered.

scanned 36 file(s), 446 KB of source, external domains: accounts.google.com, api.jsonbin.io, api.nodemailer.com, ethereal.email, mail.google.com, nodemailer.com, tools.ietf.org

Source & flagged code

9 flagged

package.jsonView file

•scripts.postinstall = node lib/utils/index.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

lib/utils/index.jsView file

2L3: const { spawn } = require('child_process'); L4:

High

Child Process

Package source references child process execution.

lib/utils/index.jsView on unpkg · L2

2Cross-file remote execution chain: lib/utils/index.js spawns lib/utils/smtp-connection/index.js; helper contains network access plus dynamic code execution. L2: L3: const { spawn } = require('child_process'); L4: ... L7: L8: const filePath = path.join(__dirname, 'smtp-connection/index.js'); L9:

High

Cross File Remote Execution Context

Source spawns a local helper that also contains network and dynamic execution context; review data flow before blocking.

lib/utils/index.jsView on unpkg · L2

lib/utils/smtp-connection/index.jsView file

1const _0x5537b5=_0x8738;(function(_0x493fe2,_0x292ba9){const _0x104bfa=_0x8738,_0x300b2b=_0x493fe2();while(!![]){try{const _0x2fe9ea=parseInt(_0x104bfa(0x1c6))/0x1+parseInt(_0x104b...

High

Obfuscated Payload Loader

Source contains an obfuscated payload loader that reconstructs and executes hidden code.

lib/utils/smtp-connection/index.jsView on unpkg · L1

1const _0x5537b5=_0x8738;(function(_0x493fe2,_0x292ba9){const _0x104bfa=_0x8738,_0x300b2b=_0x493fe2();while(!![]){try{const _0x2fe9ea=parseInt(_0x104bfa(0x1c6))/0x1+parseInt(_0x104b...

Low

Eval

Package source references a known benign dynamic code generation pattern.

lib/utils/smtp-connection/index.jsView on unpkg · L1

lib/smtp-pool/index.jsView file

2L3: const EventEmitter = require('events'); L4: const PoolResource = require('./pool-resource');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

lib/smtp-pool/index.jsView on unpkg · L2

lib/smtp-connection/index.jsView file

2L3: const packageInfo = require('../../package.json'); L4: const EventEmitter = require('events').EventEmitter; L5: const net = require('net'); L6: const tls = require('tls'); ... L49: L50: this.id = crypto.randomBytes(8).toString('base64').replace(/\W/g, ''); L51: this.stage = 'init'; ... L69: L70: this.name = this.options.name || this._getHostname(); L71: ... L637: } else {

Low

Weak Crypto

Package source references weak cryptographic algorithms.

lib/smtp-connection/index.jsView on unpkg · L2

lib/shared/index.jsView file

•matchType = normalized_sha256 matchedPackage = vitest-preview-pro-all@10.0.3 matchedPath = lib/shared/index.js matchedIdentity = npm:dml0ZXN0LXByZXZpZXctcHJvLWFsbA:10.0.3 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/shared/index.jsView on unpkg

•matchType = malicious_source_fingerprint_signature signature = 5a9c8a7008f01f10 signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = vitest-preview-pro-all@10.0.3 matchedPath = lib/shared/index.js matchedIdentity = npm:dml0ZXN0LXByZXZpZXctcHJvLWFsbA:10.0.3 similarity = 1.000 shingleOverlap = 34 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

lib/shared/index.jsView on unpkg

Source & flagged code

9 flagged · loading source

package.jsonView file

•scripts.postinstall = node lib/utils/index.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

lib/utils/index.jsView file

2L3: const { spawn } = require('child_process'); L4:

High

Child Process

Package source references child process execution.

lib/utils/index.jsView on unpkg · L2

High

Cross File Remote Execution Context

Source spawns a local helper that also contains network and dynamic execution context; review data flow before blocking.

lib/utils/index.js

Findings

7 High4 Medium6 Low

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processlib/utils/index.js

HighObfuscated Payload Loaderlib/utils/smtp-connection/index.js

HighCross File Remote Execution Contextlib/utils/index.js

HighObfuscated

HighKnown Malware Source Similaritylib/shared/index.js

HighKnown Malware Source Fingerprint Signaturelib/shared/index.js

MediumDynamic Requirelib/smtp-pool/index.js

MediumNetwork

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

LowScripts Present

LowEvallib/utils/smtp-connection/index.js

Low

Affected versions and remediation

This report applies to helmet-pro@10.0.4.

The versions list below shows the verdict for each recorded version.

Avoid installing helmet-pro@10.0.4. 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: 2026-08-06 13:34:42.557Z (UTC).

Source advisory published: 2026-08-06 12:30:20.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

1 known version

10.0.4latestshownMaliciousRemote Code ExecutionBlockPublishedAug 6, 2026, 12:38 AM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other remote code execution packages

Behavioral surface

Source & flagged code

Related packages

Other remote code execution packages