# libwebsockets-test-server security updates

Patch Radar has 12 security fixes for libwebsockets-test-server, closing 5 CVEs. The newest is libwebsockets-test-server 4.0.20-2ubuntu1.1+esm2 (4.0.20-2ubuntu1.1+esm2), released October 8, 2026.

- Web page: https://patchblox.com/security/product/linux/libwebsockets-test-server
- Platform: Linux
- Supported: yes

## Security fixes, newest first

| Fix | Released | Fixed in | Priority | CVEs | Exploited |
|---|---|---|---|---:|---:|
| [libwebsockets-test-server 4.0.20-2ubuntu1.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libwebsockets-test-server-4.0.20-2ubuntu1.1-esm2.md) | Oct 8, 2026 | Ubuntu 22.04.1 LTS (jammy) 4.0.20-2ubuntu1.1+esm2 | Urgent | 1 | 0 |
| [libwebsockets-test-server 4.3.3-1.1ubuntu0.1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwebsockets-test-server-4.3.3-1.1ubuntu0.1-esm3.md) | Oct 8, 2026 | Ubuntu 24.04.5 LTS (noble) 4.3.3-1.1ubuntu0.1~esm3 | Urgent | 1 | 0 |
| [libwebsockets-test-server 3.2.1-3ubuntu0.1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libwebsockets-test-server-3.2.1-3ubuntu0.1-esm3.md) | Oct 8, 2026 | Ubuntu 20.04 LTS (focal) 3.2.1-3ubuntu0.1~esm3 | Urgent | 1 | 0 |
| [libwebsockets-test-server 2.0.3-3ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libwebsockets-test-server-2.0.3-3ubuntu0.1-esm1.md) | Oct 8, 2026 | Ubuntu 18.04.6 LTS (bionic) 2.0.3-3ubuntu0.1~esm1 | Urgent | 1 | 0 |
| [libwebsockets-test-server 4.3.5-3ubuntu1.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwebsockets-test-server-4.3.5-3ubuntu1.2-esm1.md) | Sep 15, 2026 | Ubuntu 26.04.1 LTS (resolute) 4.3.5-3ubuntu1.2+esm1 | Urgent | 1 | 0 |
| [libwebsockets-test-server 4.3.3-1.1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwebsockets-test-server-4.3.3-1.1ubuntu0.1-esm2.md) | Aug 23, 2026 | Ubuntu 24.04.5 LTS (noble) 4.3.3-1.1ubuntu0.1~esm2 | Routine | 2 | 0 |
| [libwebsockets-test-server 4.3.5-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwebsockets-test-server-4.3.5-3ubuntu1.1.md) | Aug 23, 2026 | Ubuntu 26.04.1 LTS (resolute) 4.3.5-3ubuntu1.1 | Routine | 2 | 0 |
| [libwebsockets-test-server 3.2.1-3ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libwebsockets-test-server-3.2.1-3ubuntu0.1-esm2.md) | Jun 2, 2026 | Ubuntu 20.04 LTS (focal) 3.2.1-3ubuntu0.1~esm2 | Routine | 1 | 0 |
| [libwebsockets-test-server 4.0.20-2ubuntu1.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libwebsockets-test-server-4.0.20-2ubuntu1.1-esm1.md) | Jun 2, 2026 | Ubuntu 22.04.1 LTS (jammy) 4.0.20-2ubuntu1.1+esm1 | Routine | 1 | 0 |
| [libwebsockets-test-server 4.0.20-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libwebsockets-test-server-4.0.20-2ubuntu1.1.md) | Oct 20, 2025 | Ubuntu 22.04.1 LTS (jammy) 4.0.20-2ubuntu1.1 | Routine | 2 | 0 |
| [libwebsockets-test-server 4.3.3-1.1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwebsockets-test-server-4.3.3-1.1ubuntu0.1-esm1.md) | Oct 20, 2025 | Ubuntu 24.04.5 LTS (noble) 4.3.3-1.1ubuntu0.1~esm1 | Routine | 2 | 0 |
| [libwebsockets-test-server 3.2.1-3ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libwebsockets-test-server-3.2.1-3ubuntu0.1-esm1.md) | Oct 20, 2025 | Ubuntu 20.04 LTS (focal) 3.2.1-3ubuntu0.1~esm1 | Routine | 1 | 0 |

---

Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo