Which versions of fastapi-middleware-cors are malicious?

The following PyPI versions of fastapi-middleware-cors are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate fastapi-middleware-cors if I installed it?

fastapi-middleware-cors is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed fastapi-middleware-cors — how do I know if it already compromised me?

If fastapi-middleware-cors was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is fastapi-middleware-cors part of a known attack campaign?

Yes — fastapi-middleware-cors is associated with the 2026-03-fastapi-middleware-cors campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find fastapi-middleware-cors across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for fastapi-middleware-cors (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging fastapi-middleware-cors across your stack and pipelines.

Malicious package

fastapi-middleware-corsPyPI

Malicious code in fastapi-middleware-cors (PyPI) Remove it immediately and rotate any exposed credentials.

MAL-2026-1422

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

pip uninstall fastapi-middleware-cors

What this malware does

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

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

305178589615e2247b892b3e305e5fd69a0fc02092f0b115b6b384441f5ddd46

Detection & response playbook

Credential / info stealer

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for fastapi-middleware-cors (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging fastapi-middleware-cors across your stack and pipelines.
If you installed it — respond
fastapi-middleware-cors is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If fastapi-middleware-cors was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks fastapi-middleware-cors before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. fastapi-middleware-cors on PyPI has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-03-fastapi-middleware-cors

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks fastapi-middleware-cors-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring