# MAL-2026-12776: Malicious code in devplatform-spa-plugin-root-sentry (npm)


- **Type:** Malicious package
- **Package:** `devplatform-spa-plugin-root-sentry` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-j69h-cpjh-f2j3

## What is MAL-2026-12776?

MAL-2026-12776 is a malicious package in devplatform-spa-plugin-root-sentry, published on 5 Aug 2026. 

### Official description

Package presents as a Sentry-related SPA plugin but the exported class is an empty stub; index.js requires _bootstrap.js, which on load selects a platform-specific endpoint, fetches an opaque binary from Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with hostnames reconstructed at runtime via array-join to evade literal detection, writes it to /tmp or %TEMP% under disguised names (.cache_<hex>, dotnet_diag_<hex>.exe), chmods 0755, and spawns it detached via /bin/sh or cmd. If HTTPS mirrors fail, a DNS-TXT fallback channel queries c.<domain> at sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru for a chunk count and reassembles base64-encoded payload chunks from N.<domain> TXT records. A second file lib/telemetry.js contains an unreferenced variant of the same dropper. The Cloudflare Workers and wel1.ru destinations are unrelated to any legitimate Sentry infrastructure, and the package's advertised functionality is a cover story around the dropper.

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-2026-12776?

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-2026-12776 is a malicious package: devplatform-spa-plugin-root-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-2026-12776/ (Markdown: https://insights.sbomify.com/MAL-2026-12776/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12776

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12776/
Summaries are generated and may contain mistakes; the official description above is the record.