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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.

PUBLISHED Reserved 2025-10-13 | Published 2025-10-20 | Updated 2025-10-24 | Assigner Nozomi




MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Problem types

CWE-416 Use After Free

Product status

Default status
unaffected

3 (semver)
affected

Credits

Raffaele Bova at Nozomi Networks finder

References

libwebsockets.org/...f082ec31261f556969160143ba94875d783971a patch vendor-advisory

www.nozominetworks.com/...rability-advisories-cve-2025-11677 third-party-advisory

cve.org (CVE-2025-11677)

nvd.nist.gov (CVE-2025-11677)

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