# pyuserox (PyPI) malicious package — MAL-2026-18755 | O3 Security

Malicious package

# pyuseroxPyPI

Advisory published Nov 7, 2026·Updated Nov 8, 2026

pyuserox is a confirmed malicious PyPI package (MAL-2026-18755) that steals credentials and exfiltrates sensitive data (malicious version 0.0.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in pyuserox (PyPI)

MAL-2026-18755

Immediate action

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

pip uninstall pyuserox

## What this malware does

During import, package silently download and executes remote code. There is no other action. During analysis, the remote code was no longer accessible. The campaign was originally discovered by Threx-code.

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

Campaign: 2026-11-old-pyuserfox

Reasons (based on the campaign):

-   Downloads and executes a remote malicious script.

## Malicious versions

1 flagged

0.0.2

## Indicators of compromise (SHA-256)

9554cf718372c4b1b545c805969d454a5baa65b62274339b1a00fd80ce6e7a86

## Detection & response playbook

Credential / info stealer

1.  ### Find it
    
    Search your lockfiles and build artifacts for pyuserox (version 0.0.2).
    
2.  ### If you installed it — respond
    
    pyuserox 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.
    
3.  ### Did it already run?
    
    If pyuserox was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
    

## Frequently asked questions

No. pyuserox on PyPI has been identified as a malicious package (version 0.0.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

## Campaign

2026-11-old-pyuserfox

## References

-   [github.com](https://github.com/ossf/malicious-packages/pull/1749)
-   [bad-packages.kam193.eu](https://bad-packages.kam193.eu/pypi/package/pyuserox)

## Credits

-   Kamil Mańkowski (kam193) · reporter

## Detect & block this

O3 blocks pyuserox\-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](/malware-detection) [Runtime egress monitoring](/egress-monitor)

## Explore

[All malware advisories](/malware) [How O3 detects malware](/malware-database) [Vulnerability database](/vulnerability)