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[USN-8909-1] libde265 vulnerability

Posted on 08 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8909-1
October 08, 2026

libde265 vulnerability
==========================================================================
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:

libde265 could be made to crash if it received specially crafted input.

Software Description:
- libde265: Open source implementation of the h.265 video codec

Details:

It was discovered that libde265 did not properly validate certain crafted
H.265 bitstreams, leading to a NULL pointer dereference. An attacker could
possibly use this issue to cause libde265 to crash, resulting in a denial
of service.

Update instructions:

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

Ubuntu 26.04 LTS
libde265-0 1.0.16-1ubuntu0.1~esm2
Available with Ubuntu Pro
libde265-dev 1.0.16-1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 24.04 LTS
libde265-0 1.0.15-1ubuntu0.2
libde265-dev 1.0.15-1ubuntu0.2

Ubuntu 22.04 LTS
libde265-0 1.0.8-1ubuntu0.3+esm3
Available with Ubuntu Pro
libde265-dev 1.0.8-1ubuntu0.3+esm3
Available with Ubuntu Pro

Ubuntu 20.04 LTS
libde265-0 1.0.4-1ubuntu0.4+esm3
Available with Ubuntu Pro
libde265-dev 1.0.4-1ubuntu0.4+esm3
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libde265-0 1.0.2-2ubuntu0.18.04.1~esm7
Available with Ubuntu Pro
libde265-dev 1.0.2-2ubuntu0.18.04.1~esm7
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libde265-0 1.0.2-2ubuntu0.16.04.1~esm7
Available with Ubuntu Pro
libde265-dev 1.0.2-2ubuntu0.16.04.1~esm7
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8909-1
CVE-2026-88373

Package Information:
https://launchpad.net/ubuntu/+source/libde265/1.0.15-1ubuntu0.2

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