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OpenAdvisories
Malicious MAL-2025-939

kotlin-stdlib-jdk8

PyPI package · versions 99.1.1

Reported Nov 29, 2024 · Updated Mar 19, 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 (f217cf2fd34c9cab642b70bd9d778e6ef08a3dfba1954060a29983f2d3e6d47e)
Importing the module triggers sending out the hostname to the package author. It looks to be a placeholder/pentest activity related to BytedDance.

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Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.

Campaign: 2024-11-0wn-sh

Reasons (based on the campaign):

- The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.

Indicators of compromise

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

Domains