# MAL-2026-1422: Malicious code in fastapi-middleware-cors (PyPI)


- **Type:** Malicious package
- **Package:** `fastapi-middleware-cors` (PyPI)
- **Published:** 13 Mar 2026

## What is MAL-2026-1422?

MAL-2026-1422 is a malicious package in fastapi-middleware-cors, published on 13 Mar 2026. 

### Official description

Library disguised as FastAPI helper is executing obfuscated code during importing the module. The code is highly obfuscated; the code seems to contain an installation beacon reporting to a Telegram channel.

The package name appears as a dependency in a few Github repositories created long before publishing it, suggesting it might be an attempt to hijack the name that was previously wrongly generated by AI.

---

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

Campaign: 2026-03-fastapi-middleware-cors

Reasons (based on the campaign):

 - typosquatting

 - obfuscation

 - exfiltration-generic

## What should I do about MAL-2026-1422?

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-2026-1422 is a malicious package: fastapi-middleware-cors (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-2026-1422/ (Markdown: https://insights.sbomify.com/MAL-2026-1422/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-1422

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-1422/
Summaries are generated and may contain mistakes; the official description above is the record.