# MAL-2026-13252: Malicious code in bigops-storio (npm)


- **Type:** Malicious package
- **Package:** `bigops-storio` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-g548-9c3x-q2r5

## What is MAL-2026-13252?

MAL-2026-13252 is a malicious package in bigops-storio, published on 5 Aug 2026. 

### Official description

On require() of bigops-storio, _support.js selects a platform-specific endpoint and fetches an opaque binary over HTTPS from one of four string-split *.workers.dev hosts (oob-worker.cf100-416.workers.dev, cf101-adf, cf99-9b3, cf103-070 under workers.dev), assembled at runtime via array.join("") to hide the destinations from static inspection. The fetched bytes are written to /tmp or %TEMP% under a hidden random filename (dot-prefixed / dotnet_diag-style cover names), chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe /c start /b with stdio ignored. A DNS-TXT fallback (txtFetch/dns.resolveTxt against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru — also assembled from string fragments) reassembles N base64-encoded TXT chunks into the same executable payload when HTTPS delivery fails. There is no version pinning, no hash or signature verification, and the fetched executable is unrelated to the package's stated storio abstraction purpose. The dropper runs automatically at library load time via index.js's try{require('./_support')}.

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-2026-13252?

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-2026-13252 is a malicious package: bigops-storio (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-2026-13252/ (Markdown: https://insights.sbomify.com/MAL-2026-13252/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13252

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-13252/
Summaries are generated and may contain mistakes; the official description above is the record.