web3-py-checksum

GHSA-6f9c-35pv-cw2w

Malicious code in web3-py-checksum (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 1.1`

## Source: kam193 (4b2052172f5c854b2e91f6bdc9336a97469cd161372621a1880d9cd1e3ad426a)
The code silently exfiltrates the private key of a crypto account.


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


Campaign: 2026-05-old-web3-py-checksum


Reasons (based on the campaign):


 - crypto-related


 - exfiltration-crypto

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/web3-py-checksum/MAL-2026-3411.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/web3-py-checksum
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/web3-py-checksum/MAL-2026-3411.json
- https://github.com/advisories/GHSA-6f9c-35pv-cw2w

Compromised versions (1)

= 1.1

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