fastapi-middleware-cors

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: kam193 (305178589615e2247b892b3e305e5fd69a0fc02092f0b115b6b384441f5ddd46)
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.


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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

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/fastapi-middleware-cors/MAL-2026-1422.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/fastapi-middleware-cors
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/fastapi-middleware-cors/MAL-2026-1422.json
- https://github.com/advisories/GHSA-8vgc-qmrq-c54x

Compromised versions (1)

• = 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.