registry / Credential exfiltration / @henrylabs/mcp / 1.16.0

@henrylabs/mcp@1.16.0

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The official MCP Server for the Henry SDK API

AI Security Review

scanned 1mo ago · by lpm-firewall-ai

No install hook, persistence, destructive action, or covert automatic exfiltration was found. The package still exposes a real, high-impact MCP capability that forwards credentials remotely and can evaluate supplied code, so it warrants a warning rather than publication blocking.

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

A user or MCP client launches the server and invokes execute; local execution additionally requires selecting local mode.

Impact

A compromised or untrusted MCP client can cause credential disclosure to the configured remote endpoint or misuse available local environment values.

Mechanism

Remote credential forwarding and optional sandboxed evaluation of supplied TypeScript.

AI rationale

Evidence

src/code-tool.tssrc/code-tool-worker.tssrc/instructions.tssrc/server.ts

Network endpoints1

api.stainless.com

Decision evidence

public snapshot

AI called this Suspicious at 88.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The default remote execute tool sends the Henry API key and supplied client environment values to api.stainless.com.
The optional local mode evaluates caller-provided TypeScript and gives its worker inherited environment access.
The execute tool is enabled by default and its method blocking is explicitly described as evadable.
Server instructions are fetched from a remote endpoint and returned to the MCP client.

Evidence against

package.json has no preinstall, install, or postinstall hook.
The package does not write project or agent configuration files.
Execution and network activity require launching the server and invoking its MCP tools.

Behavioral surface

Source

ChildProcessDynamicRequireEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

Source & flagged code

11 flagged

instructions.jsView file

•matchType = normalized_sha256 matchedPackage = cas-parser-node-mcp@1.17.1 matchedPath = instructions.js matchedIdentity = npm:Y2FzLXBhcnNlci1ub2RlLW1jcA:1.17.1 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.

instructions.jsView on unpkg

7exports.getInstructions = getInstructions; L8: const promises_1 = __importDefault(require("fs/promises")); L9: const logger_1 = require("./logger.js");

Medium

Dynamic Require

Package source references dynamic require/import behavior.

instructions.jsView on unpkg · L7

code-tool.jsView file

51Source sends the broad process environment to a literal external destination. L51: type: 'image', L52: imageUrl: 'https://static.nike.com/a/images/t_web_pdp_535_v2/f_auto/example.png', L53: country: 'US', ... L157: }, L158: body: JSON.stringify({ L159: project_name: 'henry-sdk', ... L168: } L169: throw new Error(`${res.status}: ${res.statusText} error when trying to contact Code Tool server. Details: ${await res.text()}`); L170: } ... L196: // Check if deno is in PATH L197: const { execSync } = await Promise.resolve().then(() => __importStar(require('node:child_process'))); L198: try {

Critical

Hardcoded Runtime Data Exfiltration

Source sends credentials or rich application records to a package-controlled external receiver enabled by default.

code-tool.jsView on unpkg · L51

•matchType = normalized_sha256 matchedPackage = @roarkanalytics/sdk-mcp@3.6.1 matchedPath = code-tool.js matchedIdentity = npm:QHJvYXJrYW5hbHl0aWNzL3Nkay1tY3A:3.6.1 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.

code-tool.jsView on unpkg

•matchType = malicious_source_fingerprint_signature signature = 84fb15b22e4b8902 signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = @henrylabs/mcp@1.15.0 matchedPath = code-tool.js matchedIdentity = npm:QGhlbnJ5bGFicy9tY3A:1.15.0 similarity = 1.000 shingleOverlap = 33 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.

code-tool.jsView on unpkg

package.jsonView file

•scripts registry_only=start

Critical

Manifest Confusion

Tarball package.json differs from the npm registry version manifest for scripts or dependency sets.

package.jsonView on unpkg

•Remote tarball dependency specs: jq-web@https://github.com/stainless-api/jq-web/releases/download/v0.8.8/jq-web.tar.gz

Medium

Remote Tarball Dependency

Package manifest contains a dependency pinned to a remote tarball URL.

package.jsonView on unpkg

code-tool.mjsView file

•matchType = normalized_sha256 matchedPackage = @roarkanalytics/sdk-mcp@3.6.1 matchedPath = code-tool.mjs matchedIdentity = npm:QHJvYXJrYW5hbHl0aWNzL3Nkay1tY3A:3.6.1 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.

code-tool.mjsView on unpkg

src/code-tool.tsView file

•matchType = normalized_sha256 matchedPackage = @roarkanalytics/sdk-mcp@3.6.1 matchedPath = src/code-tool.ts matchedIdentity = npm:QHJvYXJrYW5hbHl0aWNzL3Nkay1tY3A:3.6.1 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/code-tool.tsView on unpkg

code-tool-worker.jsView file

•matchType = normalized_sha256 matchedPackage = @henrylabs/mcp@1.15.0 matchedPath = code-tool-worker.js matchedIdentity = npm:QGhlbnJ5bGFicy9tY3A:1.15.0 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.

code-tool-worker.jsView on unpkg

local-docs-search.jsView file

•matchType = normalized_sha256 matchedPackage = @henrylabs/mcp@1.15.0 matchedPath = local-docs-search.js matchedIdentity = npm:QGhlbnJ5bGFicy9tY3A:1.15.0 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.

local-docs-search.jsView on unpkg

Source & flagged code

11 flagged · loading source

instructions.jsView file

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

instructions.jsView on unpkg

7exports.getInstructions = getInstructions; L8: const promises_1 = __importDefault(require("fs/promises")); L9: const logger_1 = require("./logger.js");

Medium

Dynamic Require

Package source references dynamic require/import behavior.

instructions.jsView on unpkg · L7

code-tool.jsView file

Findings

2 Critical7 High5 Medium4 Low

CriticalHardcoded Runtime Data Exfiltrationcode-tool.js

CriticalManifest Confusionpackage.json

HighKnown Malware Source Similaritycode-tool.js

HighKnown Malware Source Similaritycode-tool.mjs

HighKnown Malware Source Similaritysrc/code-tool.ts

HighKnown Malware Source Similaritycode-tool-worker.js

HighKnown Malware Source Similarityinstructions.js

HighKnown Malware Source Similaritylocal-docs-search.js

HighKnown Malware Source Fingerprint Signaturecode-tool.js

MediumDynamic Requireinstructions.js

MediumNetwork

MediumEnvironment Vars

Affected versions and remediation

This report applies to @henrylabs/mcp@1.16.0.

See all versions of @henrylabs/mcp for other recorded verdicts.

Review the evidence and your use of @henrylabs/mcp@1.16.0 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: 2026-09-15 16:14:08.757Z (UTC).

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