# MAL-2026-12689: Malicious code in delivery-ci-validate-tinkoff-fb (npm)


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

## What is MAL-2026-12689?

MAL-2026-12689 is a malicious package in delivery-ci-validate-tinkoff-fb, published on 5 Aug 2026. 

### Official description

The package presents itself as a CI validation helper but `index.js` calls `require('./_adapter')` on import, causing _adapter.js to run automatically. _adapter.js assembles C2 hostnames at runtime via `.join('')` over split fragments (resolving to `oob-worker.cf10{0..3}-*.workers.dev` with a `*.dl.wel1.ru` DNS-TXT base64 fallback), downloads a platform-specific binary with no version pin or integrity check, writes it to a hidden staging path (`/var/tmp/.cache_<hex>` on Unix, `%TEMP%/dotnet_diag_<hex>.exe` impersonating a Microsoft diagnostic tool on Windows), `chmod 0755`s it, and spawns it detached via `/bin/sh -c... &` or `cmd.exe /c start /b`. A filesystem cooldown marker (`analytics_state`) and telemetry-style naming are used as cover. The exported `validate()` function is a trivial stub unrelated to the dropper.

## What should I do about MAL-2026-12689?

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-2026-12689 is a malicious package: delivery-ci-validate-tinkoff-fb (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-2026-12689/ (Markdown: https://insights.sbomify.com/MAL-2026-12689/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12689

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12689/
Summaries are generated and may contain mistakes; the official description above is the record.