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[USN-8746-1] libEBML vulnerability

Posted on 10 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8746-1
September 10, 2026

libebml vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

libEBML could be made to crash if it received specially crafted input.

Software Description:
- libebml: library for the EBML format

Details:

It was discovered that libEBML incorrectly handled certain read and write
operations. An attacker could possibly use this issue to cause a buffer
overflow, resulting in a denial of service.

Update instructions:

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

Ubuntu 22.04 LTS
libebml5 1.4.2-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
libebml4v5 1.3.10-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libebml4v5 1.3.5-2ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libebml4v5 1.3.3-1ubuntu0.1+esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8746-1
CVE-2023-52339

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