# MAL-2026-12684: Malicious code in delivery-ci-unit (npm)


- **Type:** Malicious package
- **Package:** `delivery-ci-unit` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12684?

MAL-2026-12684 is a malicious package in delivery-ci-unit, published on 5 Aug 2026. 

### Official description

On require of the package, index.js loads _loader.js, which reconstructs attacker-controlled hostnames from split-string fragments (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, plus DNS TXT chunked-base64 fallbacks at sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), fetches a platform-specific binary over HTTPS, writes it to /tmp/.cache_<hex> on Unix or TEMP\dotnet_diag_<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. No signature or hash verification is performed; filenames masquerade as system caches; a TTL marker rate-limits execution; environment-variable checks are used as evasion; and a DNS TXT covert channel serves as a fallback delivery path. The fetch host is reconstructed at runtime with no legitimate purpose, and the destinations are not the package's publisher.

## What should I do about MAL-2026-12684?

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-2026-12684 is a malicious package: delivery-ci-unit (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-2026-12684/ (Markdown: https://insights.sbomify.com/MAL-2026-12684/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12684

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12684/
Summaries are generated and may contain mistakes; the official description above is the record.