# MAL-2026-12742: Malicious code in devplatform-react-sentry (npm)


- **Type:** Malicious package
- **Package:** `devplatform-react-sentry` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-rpqj-w5qx-j792

## What is MAL-2026-12742?

MAL-2026-12742 is a malicious package in devplatform-react-sentry, published on 5 Aug 2026. 

### Official description

On require(), index.js loads _loader.js which fetches a platform-specific binary from obfuscated Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev) whose hostnames are reconstructed at runtime by joining split string arrays. The retrieved payload is written to /tmp or %TEMP% under disguised names such as dotnet_diag_*.exe or.cache_*, chmod'd 0755, and spawned detached via spawn('/bin/sh', ['-c', path+' &']) or spawn('cmd',...). No hash or signature verification is performed, and the destinations are not the publisher's infrastructure. A DNS-TXT covert-channel fallback under *.dl.wel1.ru (also assembled from split strings) delivers a base64-chunked payload when HTTPS fetch fails. The combination of split-string hostname reconstruction, non-publisher mutable delivery hosts, no integrity verification, disguised drop filenames, detached shell execution on require, and DNS-TXT delivery fallback constitutes an install/import-time dropper that executes attacker-controlled code on the installer's machine.

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-2026-12742?

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-2026-12742 is a malicious package: devplatform-react-sentry (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-2026-12742/ (Markdown: https://insights.sbomify.com/MAL-2026-12742/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12742

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12742/
Summaries are generated and may contain mistakes; the official description above is the record.