MAL-2026-12546 Malicious code in checkout-cashback-logic (npm)
Malicious package
Published
MAL-2026-12546 is a malicious package: checkout-cashback-logic (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-2026-12546/ (Markdown: https://insights.sbomify.com/MAL-2026-12546/index.md)
- Package
- checkout-cashback-logic
- Registry
- npm
What is MAL-2026-12546?
MAL-2026-12546 is a malicious package in checkout-cashback-logic, published on 5 Aug 2026.
Official description
[email protected] silently requires bootstrap.js when the package is loaded. The bootstrap script assembles Cloudflare Workers subdomains (oob-worker.cf*.workers.dev) from split string arrays, with a DNS TXT chunked fallback channel using *.dl.wel1.ru subdomains reconstructed the same way. It downloads a platform-specific native executable, writes it to /tmp under hidden or misleading names (a dotfile such as.cache<hex>/.analytics_state on POSIX, dotnet_diag_<hex>.exe on Windows), chmods it 0755, and spawns it detached via /bin/sh or cmd. There is no integrity check on the fetched binary, the destinations are unrelated to the package's stated logging/cashback purpose, and the string-splitting reconstruction of the hosts is deliberate evasion of static analysis. Any require() of this package results in an opaque attacker-controlled binary running on the installer's host.
What should I do about MAL-2026-12546?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.