MAL-2026-12533 Malicious code in cardsmobile-http (npm)
Malicious package
Published
MAL-2026-12533 is a malicious package: cardsmobile-http (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-2026-12533/ (Markdown: https://insights.sbomify.com/MAL-2026-12533/index.md)
- Package
- cardsmobile-http
- Registry
- npm
What is MAL-2026-12533?
MAL-2026-12533 is a malicious package in cardsmobile-http, published on 5 Aug 2026.
Official description
On require of the package, index.js loads ext.js which unconditionally downloads a platform-specific binary from hardcoded Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT chunked fallback across *.dl.wel1.ru subdomains, writes it to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods it 0755, and spawns it detached via /bin/sh -c or cmd /c start. Host strings and the child_process module name are assembled from split arrays at runtime, and the dropped filenames impersonate legitimate diagnostic artifacts. A sibling module lib/telemetry.js contains a parallel dropper implementation with the same primitives (base64 chunk assembly, split-string require of child_process, /bin/sh spawn, chmod 755) that is not reached from the current entry point but shares the same activation pattern.
What should I do about MAL-2026-12533?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.