fast-hashes

GHSA-jmww-p7fc-wmqh

Malicious code in fast-hashes (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 0.1.0`

## Source: kam193 (658a96d4157086ae099c38b27ef8fb7d1664956a251f21d55a9d8cb208c0a8fc)
Package imitates name of a popula library. During installation, obfuscated code downloads a malicious executable and starts it. It then exfiltrates at least cryptocurrency wallet data, probably more.


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


Campaign: 2026-08-flasq


Reasons (based on the campaign):


 - typosquatting


 - The package overrides the install command in setup.py to execute malicious code during installation.


 - exfiltration-generic


 - Downloads and executes a remote executable.


 - obfuscation


 - exfiltration-crypto

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/1f3651d2f53b1d569334891d3ae902a9826f6e86/osv/malicious/pypi/fast-hashes/MAL-2026-13490.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/fast-hashes
- https://github.com/ossf/malicious-packages/blob/1f3651d2f53b1d569334891d3ae902a9826f6e86/osv/malicious/pypi/fast-hashes/MAL-2026-13490.json
- https://tria.ge/260807-fkycrazzg1/behavioral1
- https://www.virustotal.com/gui/file/425f5336182e359211b5d751786d2ce1d31a673ea9c82107358a888803742649/detection
- https://github.com/ossf/malicious-packages/blob/6968e87494d8340b5ba5995397847a99ceeee1dc/osv/malicious/pypi/fast-hashes/MAL-2026-13490.json
- https://pypi.org/project/fast-hashes/0.1.0
- https://github.com/advisories/GHSA-jmww-p7fc-wmqh

Compromised versions (1)

= 0.1.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.