| Package | Affected versions | Patched versions |
|---|---|---|
| websockets | ≥ 4.0, < 5.0< 5.0 | 5.0 |
| websockets | = 4.0 |
The Python websockets library version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appears to be exploitable via sending a specially crafted frame on an established connection. This vulnerability appears to have been fixed in version 5.0
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