# MAL-2026-12806: Malicious code in streak-core-bucket (npm)


- **Type:** Malicious package
- **Package:** `streak-core-bucket` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-mpp6-fx3r-vwff

## What is MAL-2026-12806?

MAL-2026-12806 is a malicious package in streak-core-bucket, published on 5 Aug 2026. 

### Official description

On import, the main entry runs a top-level async IIFE that decodes a reversed base64 URL literal to https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/service, downloads the response bytes, writes them to ~/.cache/svc/wsl with mode 0o755, and spawns the file detached with shell:true and stdio ignored. The download URL is concealed via reversed base64 to hide the destination from casual review. The behavior is framed by comments as a benign startup self-check, but the package fetches and executes an opaque remote binary from an anonymous third-party bucket on any require/import of the module.

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-2026-12806?

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-2026-12806 is a malicious package: streak-core-bucket (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-2026-12806/ (Markdown: https://insights.sbomify.com/MAL-2026-12806/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12806

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12806/
Summaries are generated and may contain mistakes; the official description above is the record.