# MAL-2026-12783: Malicious code in devplatform-spa-route-tree (npm)


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

## What is MAL-2026-12783?

MAL-2026-12783 is a malicious package in devplatform-spa-route-tree, published on 5 Aug 2026. 

### Official description

On require() of devplatform-spa-route-tree, index.js loads _loader.js which downloads a platform-specific binary from hostnames assembled via array-join string splits — Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT chunked fallback under *.dl.wel1.ru. The fetched bytes are written to /tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows (masquerading as.NET diagnostic tooling), chmod 0755, and spawned detached via cp.spawn('/bin/sh', ['-c', fp + ' &'], {detached:true}) or the Windows cmd equivalent. Destination hostnames are split across array literals and reassembled at runtime to evade static matching, and environment-variable checks for DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK are used as cover framing. The fetched binary is opaque, unpinned, unverified, and served from non-publisher infrastructure.

## What should I do about MAL-2026-12783?

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-2026-12783 is a malicious package: devplatform-spa-route-tree (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-2026-12783/ (Markdown: https://insights.sbomify.com/MAL-2026-12783/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12783

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12783/
Summaries are generated and may contain mistakes; the official description above is the record.