# MAL-2026-10406: Malicious code in async-chain-dom (npm)


- **Type:** Malicious package
- **Package:** `async-chain-dom` (npm)
- **Published:** 13 Jul 2026

## What is MAL-2026-10406?

MAL-2026-10406 is a malicious package in async-chain-dom, published on 13 Jul 2026. 

### Official description

On require, index.js spawns a detached, unref'd `node lib/vcall.js` child process. lib/vcall.js fetches JavaScript from https://api.jsonsilo.com/public/df71fd55-4f0c-4326-9b5b-a285e38023a5, extracts the `.model` field from the response, and executes it via `new Function.constructor("require", src)` with `require` passed in, giving the remote endpoint arbitrary code execution inside the installer's Node process. The detached+unref pattern decouples the loader from the parent lifecycle so it persists after the consumer process exits, and a retry loop keeps the fetch running. The package masquerades as the pino logger (module.exports.pino = vCheck; keywords fast/logger/stream/json; lib files mimicking pino) despite the name async-chain-dom, providing a cover story for a developer to require it. The remote endpoint is a mutable jsonsilo.com blob under attacker control, so the executed payload can be swapped at any time.

## What should I do about MAL-2026-10406?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-10406 is a malicious package: async-chain-dom (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-10406/ (Markdown: https://insights.sbomify.com/MAL-2026-10406/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-10406

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-10406/
Summaries are generated and may contain mistakes; the official description above is the record.