# MAL-2026-3775: Malicious code in tsliverhome (npm)


- **Type:** Malicious package
- **Package:** `tsliverhome` (npm)
- **Published:** 14 May 2026
- **Also known as:** GHSA-pchc-8c97-59c8

## What is MAL-2026-3775?

MAL-2026-3775 is a malicious package in tsliverhome, published on 14 May 2026. 

### Official description

Package name 'tsliverhome' impersonates the widely-used 'tslib' package (~300M weekly downloads). The shipped README.md is a verbatim copy of Microsoft/tslib's README (titled '# tsliv', describing the TypeScript --importHelpers runtime library), designed to reassure a developer who mistyped the name. The actual code in index.js has no relation to tslib: the exported getPlugin() function issues an HTTP GET to https://verceljs-kappa.vercel.app/icons/23, JSON.parses the response body, and passes it directly to eval(). The destination is a generic Vercel preview-style host not tied to any declared publisher, is not version-pinned, and the fetched bytes are not hash- or signature-verified. Any consumer who imports this package and calls getPlugin() will execute arbitrary JavaScript under the control of whoever operates verceljs-kappa.vercel.app. Supporting signals: package.json ships placeholder metadata (empty description, empty author, no repository, no homepage), consistent with throwaway-publisher typosquat packages. The combination of (a) name-confusion with a top-tier target, (b) README impersonation of that target, and (c) a remote-fetch-and-eval payload in the exported API constitutes a deliberate supply-chain attack against developers who mistype 'tslib'.

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-2026-3775?

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-2026-3775 is a malicious package: tsliverhome (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-2026-3775/ (Markdown: https://insights.sbomify.com/MAL-2026-3775/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-3775

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-3775/
Summaries are generated and may contain mistakes; the official description above is the record.