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PYSEC-2026-586

Malicious code in tlask (PyPI)

Details

Part of the "Hades" wave of the Shai-Hulud supply-chain campaign. On 2026-06-08, malicious phantom releases of tlask were published to PyPI using stolen credentials. The package executes a bundled JavaScript payload (via the Bun runtime) on import that harvests and exfiltrates credentials and attempts self-propagation. This entry is a summary; behavior may not be fully characterized here. See the linked references for detailed analysis and indicators of compromise.

Are you affected?

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Affected packages

PyPI / tlask

No fixed version published yet for tlask (pip). Pin to a known-safe version or switch to an alternative.

References

https://inspector.pypi.io/project/tlask/3.1.4/packages/53/2a/bdac122bf1b31661cc393ebb1155b46577e7c14c5aac1dfd83c2bce41767/tlask-3.1.4-py3-none-any.whl/tlask-setup.pth [EVIDENCE]
https://www.endorlabs.com/learn/shai-hulud-hades-wave-hits-six-pypi-bioinformatics-packages [ARTICLE]
https://www.stepsecurity.io/blog/the-hades-campaign-pypi-packages [ARTICLE]