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[USN-8893-1] Libwebsockets vulnerabilities

Posted on 07 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8893-1
October 07, 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
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Libwebsockets could be made to crash or run programs if it received
specially crafted network traffic.

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

Details:

It was discovered that libwebsockets did not properly validate
user-supplied data when parsing HTTP/2 HPACK path headers, which could
result in a write past the end of an allocated buffer. An attacker could
possibly use this issue to execute arbitrary code. (CVE-2026-19773)

It was discovered that libwebsockets did not properly handle CBOR
recording in the LECP parser, which could result in a write past the end
of an allocated buffer. An attacker could possibly use this issue to
cause a crash or execute arbitrary code. (CVE-2026-78161)

Update instructions:

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

Ubuntu 26.04 LTS
libwebsockets19t64 4.3.5-3ubuntu1.2+esm1
Available with Ubuntu Pro

Ubuntu 24.04 LTS
libwebsockets19t64 4.3.3-1.1ubuntu0.1~esm3
Available with Ubuntu Pro

Ubuntu 22.04 LTS
libwebsockets16 4.0.20-2ubuntu1.1+esm2
Available with Ubuntu Pro

Ubuntu 20.04 LTS
libwebsockets15 3.2.1-3ubuntu0.1~esm3
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libwebsockets8 2.0.3-3ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libwebsockets7 1.7.1-1ubuntu0.1~esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8893-1
CVE-2026-19773

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