Improper Input Validation Affecting websocket-server package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-WEBSOCKETSERVER-15046798
- published21 Jan 2026
- disclosed20 Jan 2026
- creditMuhammadrasul Zohidjonov
Introduced: 20 Jan 2026
CVE-2025-66902 (opens in a new tab)How to fix?
There is no fixed version for websocket-server.
Overview
websocket-server is an A simple fully working websocket-server in Python with no external dependencies
Affected versions of this package are vulnerable to Improper Input Validation via the WebSocketServer._message_received component. An attacker can access sensitive information or trigger unintended server actions by sending specially crafted input to the server.