# MAL-2026-5994: Malicious code in ts-webplug (npm)


- **Type:** Malicious package
- **Package:** `ts-webplug` (npm)
- **Published:** 17 Jun 2026
- **Also known as:** GHSA-m637-4v9j-499p

## What is MAL-2026-5994?

MAL-2026-5994 is a malicious package in ts-webplug, published on 17 Jun 2026. 

### Official description

The package impersonates the pino logger (README titled 'chai-mocks', badges linking to pinojs/pino, module export named `pino`) while its actual package name `ts-webplug` is unrelated. When a consumer requires the package and invokes its exported middleware, `index.js` spawns `lib/caller.js` as a detached Node child process. `lib/caller.js` performs `axios.get(...)` against https://jsonhosting.com/api/json/9343c2ce/raw, extracts the `cookie` field from the response, and passes it to `new Function.constructor('require', s)(require)` — evaluating attacker-controlled JavaScript with full `require` access in the consumer's Node process. The remote URL is additionally concealed in a spoofed `process.env` object where `DEV_API_KEY` is a base64 blob decoding to a jsonkeeper.com URL (a second mutable, anonymous-host pointer in `lib/const.js` decodes to https://jsonkeeper.com/b/4NAKK). The fetch host is a mutable anonymous paste service — today's payload can be swapped for anything at any time — and the executed code runs with full Node privileges on the installer/consumer 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-2026-5994?

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-2026-5994 is a malicious package: ts-webplug (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-2026-5994/ (Markdown: https://insights.sbomify.com/MAL-2026-5994/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-5994

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-5994/
Summaries are generated and may contain mistakes; the official description above is the record.