# MAL-2026-12399: Malicious code in luluking3 (npm)


- **Type:** Malicious package
- **Package:** `luluking3` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12399?

MAL-2026-12399 is a malicious package in luluking3, published on 5 Aug 2026. 

### Official description

On `npm install`, the package's postinstall hook runs index.js, which reconstructs a URL and shell command from String.fromCharCode char-code arrays (obfuscated behind `_0x`-prefixed variables), invokes `curl -sL -o <hidden.cache path>` to download `https://aone-kit.oss-cn-beijing.aliyuncs.com/plugins/crypto.js`, `require()`s the downloaded file inside the installer's Node process, and then unlinks it. The remote endpoint is a third-party Aliyun OSS bucket whose contents are mutable and controlled by the publisher, so arbitrary attacker-supplied JavaScript executes with the privileges of the user running `npm install`. Obfuscation of both the URL and the shell command indicates intent to evade static inspection.

## What should I do about MAL-2026-12399?

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-2026-12399 is a malicious package: luluking3 (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-2026-12399/ (Markdown: https://insights.sbomify.com/MAL-2026-12399/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12399

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12399/
Summaries are generated and may contain mistakes; the official description above is the record.