# MAL-2026-12548: Malicious code in checkout-commit-pos-order-am (npm)


- **Type:** Malicious package
- **Package:** `checkout-commit-pos-order-am` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12548?

MAL-2026-12548 is a malicious package in checkout-commit-pos-order-am, published on 5 Aug 2026. 

### Official description

checkout-commit-pos-order-am@35.8.4 executes a dropper on module load. Its main entry `index.js` requires `_shim.js`, which selects a platform-specific asset path and downloads an opaque native binary over HTTPS from hardcoded `oob-worker.cf102-baf.workers.dev`, `oob-worker.cf99-9b3.workers.dev`, and `oob-worker.cf103-070.workers.dev` hosts, with a DNS TXT-record fallback that reassembles base64 chunks from `sdk.dl.wel1.ru`, `ext.dl.wel1.ru`, `pkg.dl.wel1.ru`, and `net.dl.wel1.ru`. Destination hostnames and the `child_process` require are built at runtime by joining fragmented substrings to evade static scanners. The downloaded bytes are written to `/var/tmp/.cache_<hex>` on Unix or `%TEMP%\dotnet_diag_<hex>.exe` on Windows (disguised filenames), chmod 0755, and spawned detached via `/bin/sh -c "<path> &"` or `cmd.exe /c start /b`. A parallel dropper with the same download-chmod-spawn shape is bundled as `lib/telemetry.js` (~81KB) under an analytics-SDK cover story and is not currently wired from the entry points but ships in the tarball.

## What should I do about MAL-2026-12548?

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-2026-12548 is a malicious package: checkout-commit-pos-order-am (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-2026-12548/ (Markdown: https://insights.sbomify.com/MAL-2026-12548/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12548

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12548/
Summaries are generated and may contain mistakes; the official description above is the record.