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[USN-8856-1] Kdenlive, MLT vulnerability

Posted on 30 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8856-1
September 30, 2026

kdenlive, mlt vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS

Summary:

Kdenlive, MLT could be made to run programs as your login if it opened a
specially crafted file.

Software Description:
- kdenlive: KDE Non-Linear Video Editor
- mlt: Multimedia Framework

Details:

It was discovered that Kdenlive allowed dangerous proxy parameters when
processing attacker-controlled project files. An attacker could use this to
execute arbitrary commands via the MLT framework's ante/post consumer
properties.

Update instructions:

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

Ubuntu 26.04 LTS
kdenlive 4:25.12.3-0ubuntu1.1
libmlt7 7.36.1-1ubuntu3.1
melt 7.36.1-1ubuntu3.1

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

References:
https://ubuntu.com/security/notices/USN-8856-1
CVE-2026-45184

Package Information:
https://launchpad.net/ubuntu/+source/kdenlive/4:25.12.3-0ubuntu1.1
https://launchpad.net/ubuntu/+source/mlt/7.36.1-1ubuntu3.1

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