# MAL-2026-12046: Malicious code in statist-browser-typed-client-test.jumpwork.circuitbreaker (npm)


- **Type:** Malicious package
- **Package:** `statist-browser-typed-client-test.jumpwork.circuitbreaker` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-xwjr-gcm9-3fcv

## What is MAL-2026-12046?

MAL-2026-12046 is a malicious package in statist-browser-typed-client-test.jumpwork.circuitbreaker, published on 5 Aug 2026. 

### Official description

On require() of the package's main entry, `_compat.js` runs as a side effect: it selects a per-platform payload, fetches a native binary over HTTPS from one of several Cloudflare Workers hosts whose names are reconstructed at runtime by joining small string fragments (e.g. `oob-worker.cf102-baf.workers.dev`, `oob-worker.cf103-070.workers.dev`, `oob-worker.cf100-416.workers.dev`), writes it to `/tmp/.cache_<hex>` on Unix or `%TEMP%\dotnet_diag_<hex>.exe` on Windows, chmods it 0755, and spawns it detached via `/bin/sh -c "<file> &"` or `cmd /c start /b`. A DNS-TXT covert channel provides a fallback delivery path against `*.dl.well1.site` (tin/tina/ldr/win subdomains), retrieving a count record at `c.<domain>` and then base64-encoded chunks from `<i>.<domain>` that are concatenated and executed. A second, larger duplicate of the same dropper (dynamic `child_"+"process` require, chmod-plus-detached-spawn, DNS discovery, base64 buffer assembly) is shipped as `lib/telemetry.js` in the tarball. Hostname string-array obfuscation and decoy filenames (dotfile cache, `dotnet_diag_*.exe`) indicate intentional evasion; installing or importing this package executes attacker-controlled native code on the developer's machine.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-12046?

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-2026-12046 is a malicious package: statist-browser-typed-client-test.jumpwork.circuitbreaker (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-2026-12046/ (Markdown: https://insights.sbomify.com/MAL-2026-12046/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12046

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12046/
Summaries are generated and may contain mistakes; the official description above is the record.