# MAL-2026-3669: Malicious code in 100jsss (npm)


- **Type:** Malicious package
- **Package:** `100jsss` (npm)
- **Published:** 12 May 2026

## What is MAL-2026-3669?

MAL-2026-3669 is a malicious package in 100jsss, published on 12 May 2026. 

### Official description

The main entry g.js constructs an image beacon whose src is a base64-decoded attacker URL (https://w.g32.com/g?k=) concatenated with btoa(document.location.href + '*' + document.cookie), exfiltrating the current URL and cookies cross-origin. The destination host is deliberately hidden behind atob() to evade string-based scanning. The package has placeholder metadata, no real functionality, and a trivial README, consistent with a malicious PoC/throwaway upload rather than a legitimate library. Obfuscation + exfiltration + credential-theft target (document.cookie) is an unambiguous malicious combination.

## What should I do about MAL-2026-3669?

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-2026-3669 is a malicious package: 100jsss (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-2026-3669/ (Markdown: https://insights.sbomify.com/MAL-2026-3669/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-3669

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-3669/
Summaries are generated and may contain mistakes; the official description above is the record.