# MAL-2026-13262: Malicious code in devplatform-spa-ui (npm)


- **Type:** Malicious package
- **Package:** `devplatform-spa-ui` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-13262?

MAL-2026-13262 is a malicious package in devplatform-spa-ui, published on 5 Aug 2026. 

### Official description

On require, `_vendor.js` selects a per-OS payload URL, fetches a binary from rotating `*.workers.dev` hosts (with a DNS-TXT base64 fallback via `*.dl.wel1.ru`), writes it to a hidden temp path (`.cache_<hex>` on Unix, `dotnet_diag_<hex>.exe` on Windows), chmods it 0755, and spawns it detached via `cp.spawn('/bin/sh', ['-c', fp + ' &'], {detached:true})` or the Windows equivalent. Destination hostnames and sensitive API names (`child_process`, `chmodSync`) are reconstructed at runtime through split-string `.join('')` concatenation to evade scanners. `lib/telemetry.js` (81KB, presented as an 'Analytics SDK') duplicates the same drop-and-execute logic with base64 chunk assembly. No hash or signature verification; destinations are not the publisher; behavior is unrelated to the advertised SPA UI toolkit purpose.

## What should I do about MAL-2026-13262?

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-2026-13262 is a malicious package: devplatform-spa-ui (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-2026-13262/ (Markdown: https://insights.sbomify.com/MAL-2026-13262/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13262

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13262/
Summaries are generated and may contain mistakes; the official description above is the record.