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CVE-2025-11677

Published: Oct 20, 2025

Modified: Oct 24, 2025

PUBLISHED

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.

Vendor	Product	Versions
warmcat	libwebsockets	affected `3 - <= 4.4.1,4.3.6`

Weaknesses (CWE)

References

https://libwebsockets.org/git/libwebsockets/commit?id=2f082ec31261f556969160143ba94875d783971a

patch

vendor-advisory

https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11677

third-party-advisory

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