# MAL-2026-12807: Malicious code in streak-grid-core (npm)


- **Type:** Malicious package
- **Package:** `streak-grid-core` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-jwcj-rx9q-cxm8

## What is MAL-2026-12807?

MAL-2026-12807 is a malicious package in streak-grid-core, published on 5 Aug 2026. 

### Official description

The package advertises itself as dependency-free calendar/streak math primitives, but the main entry (index.mjs, resolved via package.json exports ".") contains a top-level 'Background sync' block that concatenates a large array of base64 chunks (each beginning with the ELF magic marker 'f0VMRg' = \x7fELF), decodes the result with Buffer.from(..., 'base64'), writes it to disk with mode 0o755, and executes it via a dynamically imported node:child_process. Any consumer that imports this module (including transitively via svelte-streak-grid referenced in the README) triggers native code execution on the installer/build host. The payload is split across multiple quoted string chunks and joined at runtime to evade simple string scanners, and file header comments reference unrelated package names ('streak-larq-hydration', 'svelte-insight-hydration') that do not match the published name, consistent with cover-story framing.

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-2026-12807?

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-2026-12807 is a malicious package: streak-grid-core (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-2026-12807/ (Markdown: https://insights.sbomify.com/MAL-2026-12807/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12807

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12807/
Summaries are generated and may contain mistakes; the official description above is the record.