MAL-2026-12567 Malicious code in checkout-input-card-logic (npm)
Malicious package
Published
MAL-2026-12567 is a malicious package: checkout-input-card-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-2026-12567/ (Markdown: https://insights.sbomify.com/MAL-2026-12567/index.md)
- Package
- checkout-input-card-logic
- Registry
- npm
What is MAL-2026-12567?
MAL-2026-12567 is a malicious package in checkout-input-card-logic, published on 5 Aug 2026.
Official description
On require() of the package, index.js loads _vendor.js, which downloads a platform-specific binary from Cloudflare Workers subdomains (oob-worker.cf*.workers.dev, hostnames assembled at runtime by joining string fragments to evade static analysis) with a chunked base64 DNS-TXT fallback via *.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under cover names (
.cache_<rand>, dotnet_diag_<rand>.exe, analytics_state), chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe. There is no hash or signature verification, the publisher does not match the delivery hosts, and the package is advertised as unrelated log/checkout logic. The joint fingerprint — hostname-fragment obfuscation, anonymous workers.dev delivery, DNS-TXT fallback channel, cover-story filenames, detached native execution on import — is a supply-chain dropper.What should I do about MAL-2026-12567?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.