Description
Part of the "Hades" wave of the Shai-Hulud supply-chain campaign. On 2026-06-08,
malicious phantom releases of ensmallen 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.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | ensmallen | 0.8.101 | — | PYSEC-2026-232 |
References
- https://inspector.pypi.io/project/ensmallen/0.8.101/packages/53/bf/6210699d6165e632ebad20175808bf71e4a09a48dab3a1e0a4c002d8cc5b/ensmallen-0.8.101-py3-none-any.whl/ensmallen/_index.js 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