# MAL-2026-13538: Malicious code in delivery-ci-cli (npm)


- **Type:** Malicious package
- **Package:** `delivery-ci-cli` (npm)
- **Published:** 7 Aug 2026

## What is MAL-2026-13538?

MAL-2026-13538 is a malicious package in delivery-ci-cli, published on 7 Aug 2026. 

### Official description

On require of delivery-ci-cli, index.js loads _bootstrap.js which downloads a platform-specific native binary from string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev), writes it to /var/tmp or %TEMP% under cover-story names such as.cache_<hex>, dotnet_diag_<hex>.exe, and.analytics_state, chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe with unref(). No hash or signature verification is performed. If HTTPS mirrors fail, _bootstrap.js falls back to a DNS-TXT covert channel: it queries TXT records at c.<domain> and 0.<domain>..N.<domain> under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, base64-decodes the concatenated response into a buffer, writes it to disk, and executes it. Hostnames and API names are assembled at runtime via array.join to evade static string matching. The package README presents it as a benign 'CI CLI SDK' with empty dependencies, which serves as cover for the dropper behavior.

## What should I do about MAL-2026-13538?

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-2026-13538 is a malicious package: delivery-ci-cli (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-2026-13538/ (Markdown: https://insights.sbomify.com/MAL-2026-13538/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13538

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13538/
Summaries are generated and may contain mistakes; the official description above is the record.