# MAL-2026-4776: Malicious code in whatsfly-labfox (PyPI)


- **Type:** Malicious package
- **Package:** `whatsfly-labfox` (PyPI)
- **Published:** 24 May 2026

## What is MAL-2026-4776?

MAL-2026-4776 is a malicious package in whatsfly-labfox, published on 24 May 2026. 

### Official description

On `import whatsfly`, `whatsfly/__init__.py` invokes `ensureUsableBinaries()` from `whatsfly/dependencies/builder.py`, which downloads a native binary (`.so`/`.dll`/`.dylib`) from the GitHub Actions artifacts API for `Labfox/whatsfly`, unzips it under `whatsfly/dependencies/whatsmeow/`, and `whatsmeow.py` loads it directly via `ctypes.CDLL(...)`. The download is authenticated with a fine-grained GitHub Personal Access Token (`github_pat_11AZ7BYQI05SxpWYyU3Ctr_e2PlN...`) reconstructed at runtime from a per-character list in `whatsfly/dependencies/github_actions_download.py:7` — a deliberate obfuscation pattern used to evade GitHub's automated secret scanning. Two installer-impacting consequences follow: (1) every installer extracts the same live GitHub PAT and can use it against the author's GitHub account and the `Labfox/whatsfly` repository (credential redistribution to third parties); (2) the fetched artifact is a GitHub Actions artifact (mutable, 90-day TTL) pinned only by the loose string `version="v20"` with no hash or signature verification — anyone holding the PAT (including any installer of this package) can replace the artifact and achieve remote code execution on every subsequent importer via the ctypes load.

## What should I do about MAL-2026-4776?

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-2026-4776 is a malicious package: whatsfly-labfox (PyPI). 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-2026-4776/ (Markdown: https://insights.sbomify.com/MAL-2026-4776/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4776

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-4776/
Summaries are generated and may contain mistakes; the official description above is the record.