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Vulnerability record · CVE-2025-66902 · published 20 January 2026

CVE-2025-66902: Pithikos websocket server improper input validation vulnerability

PPithikos · Websocket Server

An input validation issue in in Pithikos websocket-server v.0.6.4 allows a remote attacker to obtain sensitive information or cause unexpected server behavior via the websocket_server/websocket_server.py, WebSocketServer._message_received components.

7.5 CVSS 3.1 High EPSS 0.42% · top 66.0% CWE-20 · Improper input validation
7.5CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

An input validation issue in in Pithikos websocket-server v.0.6.4 allows a remote attacker to obtain sensitive information or cause unexpected server behavior via the websocket_server/websocket_server.py, WebSocketServer._message_received components.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/cyberinvest211/websocket-server-vuln-poc/tree/main ExploitThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-66902), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.