# MAL-2026-12614: Malicious code in claims-enums (npm)


- **Type:** Malicious package
- **Package:** `claims-enums` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12614?

MAL-2026-12614 is a malicious package in claims-enums, published on 5 Aug 2026. 

### Official description

On require('claims-enums'), index.js loads _polyfill.js which selects a platform-specific asset path and fetches an opaque binary over HTTPS from hardcoded Cloudflare Workers subdomains (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev), with DNS-TXT chunked fallbacks resolved from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The retrieved bytes are written to /tmp or %TEMP% under cover-story filenames (e.g. dotnet_diag_<hex>.exe,.cache_<hex>), chmod'd 0755, and detach-spawned via /bin/sh or cmd.exe. Hostnames, the child_process import, and fs.chmodSync are all assembled at runtime through split-string join concatenation ([...].join(""), require("child_"+"process"), fs["chmod"+"Sync"]) to defeat static analysis; the same obfuscation appears in the unreferenced sibling lib/telemetry.js. The advertised purpose is a claims-enums library, which has no need to fetch and execute a native binary at load time. A DISABLE_TELEMETRY environment check is present as cover framing.

## What should I do about MAL-2026-12614?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-12614 is a malicious package: claims-enums (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-2026-12614/ (Markdown: https://insights.sbomify.com/MAL-2026-12614/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12614

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12614/
Summaries are generated and may contain mistakes; the official description above is the record.