# CVE-2026-78161: libwebsockets: A vulnerability was found in warmcat libwebsockets 4.5.0

CVE-2026-78161 is fixed in 7 products on 1 platform, first by libwebsockets-evlib-ev 4.3.3-1.1ubuntu0.1~esm2, released August 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-78161
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0041
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 23, 2026

## Description

A vulnerability was found in warmcat libwebsockets 4.5.0. Impacted is the function report_raw_cbor of the file lib/misc/lecp.c of the component LECP CBOR Recording. The manipulation results in out-of-bounds write. The attack can be launched remotely. The exploit has been made public and could be used. The patch is identified as 1d44554a1bb262db63ff4e240152a9deecd99054. It is best practice to apply a patch to resolve this issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libwebsockets Debian 13.5 (trixie) | 4.3.5-1+deb13u2 | [DEBIAN-CVE-2026-78161](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78161.md) | Sep 1, 2026 |
| Linux | libwebsockets Debian 14 | 4.3.5-6 | [DEBIAN-CVE-2026-78161](https://patchblox.com/security/data/fix/linux/debian-cve-2026-78161.md) | Sep 1, 2026 |
| Linux | libwebsockets-evlib-ev Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm2 | [libwebsockets-evlib-ev 4.3.3-1.1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwebsockets-evlib-ev-4.3.3-1.1ubuntu0.1-esm2.md) | Aug 23, 2026 |
| Linux | libwebsockets-evlib-ev Ubuntu 26.04.1 LTS (resolute) | 4.3.5-3ubuntu1.1 | [libwebsockets-evlib-ev 4.3.5-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwebsockets-evlib-ev-4.3.5-3ubuntu1.1.md) | Aug 23, 2026 |
| Linux | libwebsockets-evlib-glib Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm2 | [libwebsockets-evlib-glib 4.3.3-1.1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwebsockets-evlib-glib-4.3.3-1.1ubuntu0.1-esm2.md) | Aug 23, 2026 |
| Linux | libwebsockets-evlib-glib Ubuntu 26.04.1 LTS (resolute) | 4.3.5-3ubuntu1.1 | [libwebsockets-evlib-glib 4.3.5-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwebsockets-evlib-glib-4.3.5-3ubuntu1.1.md) | Aug 23, 2026 |
| Linux | libwebsockets-evlib-uv Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm2 | [libwebsockets-evlib-uv 4.3.3-1.1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwebsockets-evlib-uv-4.3.3-1.1ubuntu0.1-esm2.md) | Aug 23, 2026 |
| Linux | libwebsockets-evlib-uv Ubuntu 26.04.1 LTS (resolute) | 4.3.5-3ubuntu1.1 | [libwebsockets-evlib-uv 4.3.5-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwebsockets-evlib-uv-4.3.5-3ubuntu1.1.md) | Aug 23, 2026 |
| Linux | libwebsockets-test-server Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm2 | [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 |
| Linux | libwebsockets-test-server Ubuntu 26.04.1 LTS (resolute) | 4.3.5-3ubuntu1.1 | [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 |
| Linux | libwebsockets-test-server-common Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm2 | [libwebsockets-test-server-common 4.3.3-1.1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwebsockets-test-server-common-4.3.3-1.1ubuntu0.1-esm2.md) | Aug 23, 2026 |
| Linux | libwebsockets-test-server-common Ubuntu 26.04.1 LTS (resolute) | 4.3.5-3ubuntu1.1 | [libwebsockets-test-server-common 4.3.5-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwebsockets-test-server-common-4.3.5-3ubuntu1.1.md) | Aug 23, 2026 |
| Linux | libwebsockets19t64 Ubuntu 24.04.5 LTS (noble) | 4.3.3-1.1ubuntu0.1~esm2 | [libwebsockets19t64 4.3.3-1.1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwebsockets19t64-4.3.3-1.1ubuntu0.1-esm2.md) | Aug 23, 2026 |
| Linux | libwebsockets19t64 Ubuntu 26.04.1 LTS (resolute) | 4.3.5-3ubuntu1.1 | [libwebsockets19t64 4.3.5-3ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libwebsockets19t64-4.3.5-3ubuntu1.1.md) | Aug 23, 2026 |

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Data as of 2026-11-08T13:06:02Z 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

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