pygments-richstyle

GHSA-4f8r-7974-vrmq

Malicious code in pygments-richstyle (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: kam193 (a965f61b1e51e6c96a8987633eaf2f23001320e4c6b884c33603230c66798e74)
Packages silently decrypt content hidden in a dependency and load them as Python extension modules. 

In the first wave, those are copies of legitimate aiohttp and aiohappyeyeballs packages.
In the second wave, malicious packages created good-looking forks of legitimate rich and pigments packages.


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


Campaign: 2025-10-asynhttp


Reasons (based on the campaign):


 - typosquatting


 - exfiltration-generic


 - obfuscation


 - clones-real-package


 - native-extension

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/pygments-richstyle/MAL-2025-191654.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/pygments-richstyle
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/pygments-richstyle/MAL-2025-191654.json
- https://www.cert.at/en/blog/2025/10/how-typosquatting-tricked-me-a-bit
- https://github.com/advisories/GHSA-4f8r-7974-vrmq

Compromised versions (1)

= 1.0.0

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