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[USN-8822-1] Libwebsockets vulnerabilities

Posted on 28 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8822-1
September 25, 2026

libwebsockets vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Libwebsockets.

Software Description:
- libwebsockets: C library for building WebSocket-based network applications

Details:

It was discovered that Libwebsockets incorrectly handled certain SSH
protocol messages in its SSH protocol handler. A remote attacker could
possibly use this issue to cause Libwebsockets to consume excessive
resources, resulting in a denial of service. (CVE-2026-10650)

It was discovered that Libwebsockets incorrectly handled certain malformed
CBOR data. A remote attacker could possibly use this issue to cause
Libwebsockets to crash, resulting in a denial of service, or execute
arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04
LTS. (CVE-2026-78161)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libwebsockets-dev 4.3.5-3ubuntu1.1
libwebsockets-evlib-ev 4.3.5-3ubuntu1.1
libwebsockets-evlib-glib 4.3.5-3ubuntu1.1
libwebsockets-evlib-uv 4.3.5-3ubuntu1.1
libwebsockets-test-server 4.3.5-3ubuntu1.1
libwebsockets-test-server-common 4.3.5-3ubuntu1.1
libwebsockets19t64 4.3.5-3ubuntu1.1

Ubuntu 24.04 LTS
libwebsockets-dev 4.3.3-1.1ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets-evlib-ev 4.3.3-1.1ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets-evlib-glib 4.3.3-1.1ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets-evlib-uv 4.3.3-1.1ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets-test-server 4.3.3-1.1ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets-test-server-common 4.3.3-1.1ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets19t64 4.3.3-1.1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 22.04 LTS
libwebsockets-dev 4.0.20-2ubuntu1.1+esm1
Available with Ubuntu Pro
libwebsockets-test-server 4.0.20-2ubuntu1.1+esm1
Available with Ubuntu Pro
libwebsockets-test-server-common 4.0.20-2ubuntu1.1+esm1
Available with Ubuntu Pro
libwebsockets16 4.0.20-2ubuntu1.1+esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
libwebsockets-dev 3.2.1-3ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets-test-server 3.2.1-3ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets-test-server-common 3.2.1-3ubuntu0.1~esm2
Available with Ubuntu Pro
libwebsockets15 3.2.1-3ubuntu0.1~esm2
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8822-1
CVE-2026-10650, CVE-2026-78161

Package Information:
https://launchpad.net/ubuntu/+source/libwebsockets/4.3.5-3ubuntu1.1

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