MAL-2026-12637 Malicious code in claims-policies-api-adapters (npm)
Malicious package
Published
MAL-2026-12637 is a malicious package: claims-policies-api-adapters (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-2026-12637/ (Markdown: https://insights.sbomify.com/MAL-2026-12637/index.md)
- Package
- claims-policies-api-adapters
- Registry
- npm
What is MAL-2026-12637?
MAL-2026-12637 is a malicious package in claims-policies-api-adapters, published on 5 Aug 2026.
Official description
On require() of claims-policies-api-adapters, index.js loads vendor.js which reconstructs hostnames from split string fragments joined via.join(''), fetches a platform-specific binary over HTTPS from hardcoded Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev), with DNS TXT records under *.dl.wel1.ru as a covert fallback channel that base64-assembles the payload. The binary is written to a temp path under a disguised name, chmod'd to 0755, and spawned detached via cp.spawn('/bin/sh', ['-c', path + ' &'], {detached:true}) on Unix or cmd.exe start /b on Windows. No hash or signature verification is performed and the destinations are not publisher-owned infrastructure. An opt-out env-var gate and a '.analytics_state' freshness marker suppress re-execution. A second module lib/telemetry.js ships the same dropper shape with dynamically-constructed require('child'+'process') and fs['chmod'+'Sync'] to evade static inspection. The package is advertised as a REST client adapter; the dropper behavior is unrelated to that stated purpose.
What should I do about MAL-2026-12637?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.