# MAL-2026-13486: Malicious code in fastapii (PyPI)


- **Type:** Malicious package
- **Package:** `fastapii` (PyPI)
- **Published:** 7 Aug 2026

## What is MAL-2026-13486?

MAL-2026-13486 is a malicious package in fastapii, published on 7 Aug 2026. 

### Official description

fastapii 0.1.2 is a single-character typosquat of the popular fastapi package. Its setup.py registers a custom setuptools install cmdclass (LinuxInstall) whose post_install step decodes a base64-encoded payload (_HOOK_B64) and runs it via exec(compile(...)). On Linux, the decoded payload calls urllib.request.urlretrieve to fetch a binary from https://github.com/totti2188/8gp1Q7iZD3h4VW/releases/download/v1.3A/something into /tmp, chmods it to 0755, and launches it detached via subprocess.Popen with start_new_session=True. The GitHub account hosting the binary is unrelated to the package's declared identity, the fetch is unpinned and unverified (no hash or signature), and the Linux-only gate means the payload stays dormant on many developer laptops but fires in Linux CI and production. The shipped module is a stub named djangoo containing only a trivial hello() function, and PKG-INFO/README metadata ('HTTP client utilities', '# requestss') further obscure the package identity — the install-time dropper is the package's sole real behavior.

Package imitates name of a popula library. During installation, obfuscated code downloads a malicious executable and starts it. It then exfiltrates at least cryptocurrency wallet data, probably more.

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Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-08-flasq

Reasons (based on the campaign):

 - typosquatting

 - The package overrides the install command in setup.py to execute malicious code during installation.

 - exfiltration-generic

 - Downloads and executes a remote executable.

 - obfuscation

 - exfiltration-crypto

## What should I do about MAL-2026-13486?

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-2026-13486 is a malicious package: fastapii (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-2026-13486/ (Markdown: https://insights.sbomify.com/MAL-2026-13486/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13486

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13486/
Summaries are generated and may contain mistakes; the official description above is the record.