# MAL-2026-12737: Malicious code in devplatform-react-micro-frontend (npm)


- **Type:** Malicious package
- **Package:** `devplatform-react-micro-frontend` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-c37c-qgfc-7jr8

## What is MAL-2026-12737?

MAL-2026-12737 is a malicious package in devplatform-react-micro-frontend, published on 5 Aug 2026. 

### Official description

devplatform-react-micro-frontend@35.2.1 is a lure package whose main entry auto-loads _adapter.js on require. _adapter.js selects a platform-specific asset, downloads an opaque binary over HTTPS from a rotating list of Cloudflare *.workers.dev hosts (oob-worker.cf101-adf.workers.dev and siblings cf100/cf102/cf103), and if HTTPS fails reassembles up to 2000 numbered TXT records under *.dl.wel1.ru into a base64 payload. The bytes are written to a temp path under a masquerading name (.cache_<hex>, dotnet_diag_<hex>.exe), chmod 755 on POSIX, and spawned detached via /bin/sh -c or cmd. Network destinations are assembled by joining substring arrays (e.g. ["oob-worker.cf101-a","df.workers.","dev"].join(""), ['sdk.dl.w','el1.','ru'].join("")) to evade static analysis. A duplicate dropper is shipped as lib/telemetry.js framed as an "Analytics SDK", using string-concat obfuscation of require("child_"+"process") and fs["chmod"+"Sync"] to reach the same write-chmod-spawn sink. Installing or requiring the package results in remote-controlled binary execution on the host.

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-2026-12737?

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-2026-12737 is a malicious package: devplatform-react-micro-frontend (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-2026-12737/ (Markdown: https://insights.sbomify.com/MAL-2026-12737/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12737

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12737/
Summaries are generated and may contain mistakes; the official description above is the record.