# MAL-2026-12759: Malicious code in devplatform-spa-plugin-ability (npm)


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

## What is MAL-2026-12759?

MAL-2026-12759 is a malicious package in devplatform-spa-plugin-ability, published on 5 Aug 2026. 

### Official description

On require of the package, index.js loads _bootstrap.js which downloads a platform-specific native binary from anonymous Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT covert-channel fallback under *.dl.wel1.ru (chunk count in c.<domain>, N shards concatenated and base64-decoded into an executable buffer). Hostnames are assembled at runtime by joining split string fragments (e.g. ["oob-worker.cf102-baf.worke","rs.d","ev"].join("")). The fetched binary is written to disguised paths (/var/tmp/.cache_<hex>, %TEMP%\dotnet_diag_<hex>.exe, /pkg/package.exe|-arm64|loader_mac), chmod 0755, and spawned detached via /bin/sh -c or cmd /c start with no hash or signature verification. A lib/telemetry.js decoy file and an.analytics_state rate-limit stamp plus DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK env-var gates provide cover-story framing; the delivered payload is unrelated to the package's stated purpose (an "SPA plugin ability SDK"). Installing or requiring this package executes attacker-controlled code on the installer host.

## What should I do about MAL-2026-12759?

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-2026-12759 is a malicious package: devplatform-spa-plugin-ability (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-2026-12759/ (Markdown: https://insights.sbomify.com/MAL-2026-12759/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12759

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12759/
Summaries are generated and may contain mistakes; the official description above is the record.