CVE-2025-11677
Medium
Description
Use After Free in WebSocket server implementation in lws_handshake_server in warmcat libwebsockets may allow an attacker, in specific configurations where the user provides a callback function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to achieve denial of service.
SeverityMedium
CVSS6.3
Exploit probability—
ProductWarmcat Libwebsockets
PublishedOct 20, 2025
First seenOct 20, 2025
Weakness typeCWE-416Use after free
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| warmcat libwebsockets | 3 ≤ v ≤ 4.4.1,4.3.6 | — |
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