{"id":"CVE-2025-11677","title":"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_UPGRA…","summary":"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_UPGRA…","severity":"none","cwe":["CWE-416"],"published":"2025-10-20","updated":"2026-10-08","sourceUpdated":"2026-10-08T22:10:00.563","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-11677","references":[{"url":"https://libwebsockets.org/git/libwebsockets/commit?id=2f082ec31261f556969160143ba94875d783971a","label":"prodsec@nozominetworks.com"},{"url":"https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11677","label":"prodsec@nozominetworks.com"}],"tags":["nvd"],"epss":0.00405,"epssPercentile":0.32593,"ingestedAt":"2026-10-08T22:11:53.816Z","slug":"CVE-2025-11677","body":"## Overview\n\nUse 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}