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OpenAdvisories
Malicious MAL-2026-2519

just4testlm

PyPI package · versions 0.1.0, 0.2.0, 0.3.0, 0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.8.0, 0.9.0, 0.9.1, 0.9.2, 0.9.3

Reported Apr 9, 2026 · Updated Apr 9, 2026

If this package is installed

Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.

Details

Source: kam193 (5aed012f2ecc4af261bb7f2fc294b9aee5c0733ccf207b9e9e9a381d51387811)
The package likely tests different malicious techniques and delivering payload in setup.py. Different versions, like 0.1.0, 0.4.0 or 0.9.0 contain malicious payload in setup.py that either run remote script or exfiltrate env variables during installation. The malicious versions are also quickly removed and replaced with versions without malicious code.

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

Campaign: 2026-03-just4testlm

Reasons (based on the campaign):

- Downloads and executes a remote malicious script.

- exfiltration-env-variables

Indicators of compromise

Shown defanged and not clickable. Search any indicator to find other packages using it.

Domains

URLs