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[USN-8004-2] FreeRDP regression

Posted on 09 February 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8004-2
February 08, 2026

freerdp2 regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

USN-8004-1 introduced a regression in FreeRDP

Software Description:
- freerdp2: RDP client for Windows Terminal Services

Details:

USN-8004-1 fixed vulnerabilities in FreeRDP. The update for
CVE-2026-23533 introduced a regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Kim Dong Han discovered that FreeRDP did not correctly validate the size of
certain variables, which could cause a buffer overflow. An attacker could
possibly use this issue to cause a denial of service or execute arbitrary
code.

Update instructions:

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

Ubuntu 24.04 LTS
libfreerdp2-2t64 2.11.5+dfsg1-1ubuntu0.1~esm4
Available with Ubuntu Pro

Ubuntu 22.04 LTS
libfreerdp2-2 2.6.1+dfsg1-3ubuntu2.9

Ubuntu 20.04 LTS
libfreerdp2-2 2.6.1+dfsg1-0ubuntu0.20.04.2+esm2
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libfreerdp2-2 2.2.0+dfsg1-0ubuntu0.18.04.4+esm4
Available with Ubuntu Pro

After a standard system update you need to restart your session to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8004-2
https://ubuntu.com/security/notices/USN-8004-1
CVE-2026-23533, https://bugs.launchpad.net/bugs/2139694

Package Information:
https://launchpad.net/ubuntu/+source/freerdp2/2.6.1+dfsg1-3ubuntu2.9

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