# MAL-2026-12529: Malicious code in cardsmobile-cardsmobile-core (npm)


- **Type:** Malicious package
- **Package:** `cardsmobile-cardsmobile-core` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12529?

MAL-2026-12529 is a malicious package in cardsmobile-cardsmobile-core, published on 5 Aug 2026. 

### Official description

On require() of cardsmobile-cardsmobile-core, index.js loads _shim.js which selects a platform-specific payload path, fetches an unsigned executable from attacker-controlled Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS TXT chunked-base64 fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru, writes it to a hidden path under /var/tmp or %TEMP% with decoy names (dotnet_diag_*.exe,.cache_*), chmods 0755, and spawns it detached via /bin/sh or cmd.exe. A cooldown lockfile at /tmp/.analytics_state prevents re-runs. Endpoint hostnames and dangerous API names are assembled at runtime via.join('') from string fragments (e.g. require("child_" + "process"), fs["chmod" + "Sync"]) to evade static analysis, and lib/telemetry.js additionally decodes a base64 payload before executing it. A DISABLE_TELEMETRY environment check is present but does not gate the dropper. Loading this package grants remote code execution on the installer's host with detached persistence beyond the Node process.

## What should I do about MAL-2026-12529?

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-2026-12529 is a malicious package: cardsmobile-cardsmobile-core (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-2026-12529/ (Markdown: https://insights.sbomify.com/MAL-2026-12529/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12529

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12529/
Summaries are generated and may contain mistakes; the official description above is the record.