# MAL-2026-12681: Malicious code in delivery-ci-storybook (npm)


- **Type:** Malicious package
- **Package:** `delivery-ci-storybook` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-vjwx-6r34-p6jx

## What is MAL-2026-12681?

MAL-2026-12681 is a malicious package in delivery-ci-storybook, published on 5 Aug 2026. 

### Official description

On require() of delivery-ci-storybook, index.js loads _bridge.js which downloads a platform-specific executable from one of three anonymous Cloudflare Workers subdomains (oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) whose hostnames are reconstructed at runtime from split string fragments joined with empty separators. If the HTTP fetch fails, a fallback path reassembles base64 chunks from DNS TXT records under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The retrieved bytes are written to /var/tmp or %TEMP% under disguised names (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh -c or cmd /c start. No hash or signature verification is performed and the destinations are not publisher-controlled infrastructure. The fetched executable is attacker-controlled content executed on the installer's host at package require time.

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-2026-12681?

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-2026-12681 is a malicious package: delivery-ci-storybook (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-2026-12681/ (Markdown: https://insights.sbomify.com/MAL-2026-12681/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12681

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12681/
Summaries are generated and may contain mistakes; the official description above is the record.