# MAL-2026-12963: Malicious code in bnpl-blocks-independent-bnpl-open-api (npm)


- **Type:** Malicious package
- **Package:** `bnpl-blocks-independent-bnpl-open-api` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12963?

MAL-2026-12963 is a malicious package in bnpl-blocks-independent-bnpl-open-api, published on 5 Aug 2026. 

### Official description

On require() of bnpl-blocks-independent-bnpl-open-api, index.js loads _support.js which unconditionally executes at module load. _support.js selects a per-OS URL, downloads a binary over HTTPS from hardcoded Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev), writes the payload to a hidden file in a temp directory using cover-story names such as.cache_<uid>,.analytics_state, and dotnet_diag_, chmods it 0755 on Unix, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. No hash or signature verification is performed. Hostnames are assembled at runtime by joining split string fragments (e.g. ["oob-worker.cf101-adf.workers",".dev"].join("")) to defeat plain-text scanning, and child_process is loaded via require("child_" + "process") in lib/telemetry.js. A DNS-TXT base64 fallback channel is provided using resolvers sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.we1.ru. The download destinations and payload are unrelated to the package's stated purpose as a BNPL open API SDK.

## What should I do about MAL-2026-12963?

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-2026-12963 is a malicious package: bnpl-blocks-independent-bnpl-open-api (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-2026-12963/ (Markdown: https://insights.sbomify.com/MAL-2026-12963/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12963

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12963/
Summaries are generated and may contain mistakes; the official description above is the record.