libwebsockets-evlib-ev: Use After Free in WebSocket server implementation in lws_handshake_server in warmcat libwebsockets may allow an attac...
CVE-2025-11677 is fixed in 9 products on 1 platform, first by libwebsockets-evlib-ev 4.3.3-1.1ubuntu0.1~esm1, released October 20, 2025. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libwebsockets · Debian 11.6 (bullseye) | 4.0.20-2+deb11u1 | DLA-4373-1 | Nov 17, 2025 |
| libwebsockets · Debian 13.5 (trixie) | 4.3.5-1+deb13u1 | DEBIAN-CVE-2025-11677 | Oct 20, 2025 |
| libwebsockets · Debian 14 | 4.3.5-3 | DEBIAN-CVE-2025-11677 | Oct 20, 2025 |
| libwebsockets-evlib-ev · Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm1 | libwebsockets-evlib-ev 4.3.3-1.1ubuntu0.1~esm1 | Oct 20, 2025 |
| libwebsockets-evlib-glib · Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm1 | libwebsockets-evlib-glib 4.3.3-1.1ubuntu0.1~esm1 | Oct 20, 2025 |
| libwebsockets-evlib-uv · Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm1 | libwebsockets-evlib-uv 4.3.3-1.1ubuntu0.1~esm1 | Oct 20, 2025 |
| libwebsockets-test-server · Ubuntu 20.04 LTS (focal) | 3.2.1-3ubuntu0.1~esm1 | libwebsockets-test-server 3.2.1-3ubuntu0.1~esm1 | Oct 20, 2025 |
| libwebsockets-test-server · Ubuntu 22.04.1 LTS (jammy) | 4.0.20-2ubuntu1.1 | libwebsockets-test-server 4.0.20-2ubuntu1.1 | Oct 20, 2025 |
| libwebsockets-test-server · Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm1 | libwebsockets-test-server 4.3.3-1.1ubuntu0.1~esm1 | Oct 20, 2025 |
| libwebsockets-test-server-common · Ubuntu 20.04 LTS (focal) | 3.2.1-3ubuntu0.1~esm1 | libwebsockets-test-server-common 3.2.1-3ubuntu0.1~esm1 | Oct 20, 2025 |
| libwebsockets-test-server-common · Ubuntu 22.04.1 LTS (jammy) | 4.0.20-2ubuntu1.1 | libwebsockets-test-server-common 4.0.20-2ubuntu1.1 | Oct 20, 2025 |
| libwebsockets-test-server-common · Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm1 | libwebsockets-test-server-common 4.3.3-1.1ubuntu0.1~esm1 | Oct 20, 2025 |
| libwebsockets15 · Ubuntu 20.04 LTS (focal) | 3.2.1-3ubuntu0.1~esm1 | libwebsockets15 3.2.1-3ubuntu0.1~esm1 | Oct 20, 2025 |
| libwebsockets16 · Ubuntu 22.04.1 LTS (jammy) | 4.0.20-2ubuntu1.1 | libwebsockets16 4.0.20-2ubuntu1.1 | Oct 20, 2025 |
| libwebsockets19t64 · Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm1 | libwebsockets19t64 4.3.3-1.1ubuntu0.1~esm1 | Oct 20, 2025 |
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