---
id: "MAL-2026-19224"
page: "https://infrastack.ai/live/MAL-2026-19224"
kind: "package"
aliases: ["MAL-2026-19224"]
title: "Malicious code in helper-agent (npm)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "helper-agent", "fixed": [], "affected": "= 1.0.4; = 1.0.1", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-11-13T03:55:49+00:00"
first_seen_at: "2026-11-13T05:11:56+00:00"
updated_at: "2026-11-13T05:14:00+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-19224", "first_seen_at": "2026-11-13T05:11:56+00:00"}]
exploit_sources: []
---

# Malicious code in helper-agent (npm)

Link for people: https://infrastack.ai/live/MAL-2026-19224 (this .md is for agents)

## Affected

- npm:helper-agent affected = 1.0.4; = 1.0.1 fixed no fixed version listed

## Timeline

- 2026-11-13T05:11:56+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-19224

## From the sources

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_-= Per source details. Do not edit below this line.=-_

## Source: amazon-inspector (4ab651b6042b8ef6c2c986a58d276931d9353d723fd914c9b7c728cac5cf0fc9)
The package declares a postinstall script `node probe.cjs` that fires on every `npm install`. On execution it POSTs install-start and status markers to a hardcoded webhook.site dead-drop (https://webhook.site/a4bf0f9f-6d96-46e6-80ac-b76a5329f481), then scans several localhost ports (1337, 80, 3000, 8080, 5000) for a specific JSON API and, when a matching record (id `ECT-987654`) is found, issues a PUT that overwrites that service's manifest with an author-chosen status string. Both the outbound beacon destination and the local mutation target are hardcoded and not user-configurable. The package.json self-describes as an "Authorized HTB dependency-resolution canary" and the mutation path is gated to a narrow challenge record, but the install-time outbound beacon and localhost scanning fire unconditionally for any installer, confirming installer execution to a third-party collector and granting the author write access to a matching local service on the installer's host.

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