MAL-2026-12626 Malicious code in claims-is-mobile-layout (npm)
Malicious package
Published
MAL-2026-12626 is a malicious package: claims-is-mobile-layout (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-2026-12626/ (Markdown: https://insights.sbomify.com/MAL-2026-12626/index.md)
- Package
- claims-is-mobile-layout
- Registry
- npm
What is MAL-2026-12626?
MAL-2026-12626 is a malicious package in claims-is-mobile-layout, published on 5 Aug 2026.
Official description
On require() of the package, index.js unconditionally loads./vendor.js, which selects a platform-specific endpoint, downloads a native binary over HTTPS, writes it to /tmp/.cache<hex> on Linux/macOS or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe. Destination hostnames are assembled at runtime via Array.join over split string literals (e.g. 'oob-worker.cf102-baf.workers.dev' on anonymous Cloudflare Workers subdomains) to evade static URL/domain scanning. A DNS-TXT covert-channel fallback under .dl.wel1.ru chunks a base64 payload across numbered TXT records, reassembles it, and decodes it as executable content. The dropped binary is staged under cover-story names ('analytics_state', 'dotnet_diag_') that do not match the package's advertised 'mobile layout' purpose.
What should I do about MAL-2026-12626?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.