Heap-based buffer overflow in FreeRDP - CVE-2026-23534

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Main Vulnerability Database Vulnerabilities #VU121939

Heap-based buffer overflow in FreeRDP - CVE-2026-23534

Published: January 22, 2026


Vulnerability identifier: #VU121939
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-23534
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: Public exploit is available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in clear_decompress_bands_data. A remote attacker can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Affected software

FreeRDP
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Anolis OS
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
SUSE Package Hub 15
openSUSE Leap
Ubuntu
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
freerdp-devel
winpr2-devel
freerdp2 (Ubuntu package)
libwinpr2
freerdp-debugsource
libfreerdp2
libfreerdp2-debuginfo
libwinpr2-debuginfo
freerdp-debuginfo
freerdp-wayland-debuginfo
freerdp
freerdp-server-debuginfo
freerdp-proxy
freerdp-proxy-debuginfo
freerdp-server
freerdp-wayland
libuwac0-0
uwac0-0-devel
libuwac0-0-debuginfo
freerdp (Red Hat package)
libwinpr2-2-debuginfo
libfreerdp2-2-debuginfo
libwinpr2-2
winpr-devel
libfreerdp2-2
freerdp-libs
libwinpr
libwinpr-devel
freerdp-doc
freerdp2-proxy
freerdp2-devel
freerdp2-server-debuginfo
freerdp2-server
freerdp2
freerdp2-debuginfo
freerdp2-debugsource
freerdp2-proxy-debuginfo
freerdp-help
freerdp3 (Ubuntu package)

How to mitigate CVE-2026-23534

Install updates from vendor's website.

FreeRDP - update to 3.21.0
freerdp-devel - addressed in versions 2.1.2-12.52.1, 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
winpr2-devel - addressed in versions 2.1.2-12.52.1, 2.4.0-150400.3.35.1, 2.11.7-150700.3.3.1
freerdp2 (Ubuntu package) - addressed in versions 2.2.0+dfsg1-0ubuntu0.18.04.4+esm3, 2.6.1+dfsg1-0ubuntu0.20.04.2+esm1, 2.6.1+dfsg1-3ubuntu2.8, 2.11.5+dfsg1-1ubuntu0.1~esm3
libwinpr2 - update to 2.4.0-150400.3.35.1
freerdp-debugsource - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
libfreerdp2 - update to 2.4.0-150400.3.35.1
libfreerdp2-debuginfo - update to 2.4.0-150400.3.35.1
libwinpr2-debuginfo - update to 2.4.0-150400.3.35.1
freerdp-debuginfo - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
freerdp-wayland-debuginfo - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
freerdp - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
freerdp-server-debuginfo - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
freerdp-proxy - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
freerdp-proxy-debuginfo - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
freerdp-server - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
freerdp-wayland - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
libuwac0-0 - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
uwac0-0-devel - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
libuwac0-0-debuginfo - addressed in versions 2.4.0-150400.3.35.1, 2.11.2-150600.4.6.1
freerdp (Red Hat package) - addressed in versions 2.11.2-1.el9_4.1, 2.11.7-2.el8_10, 3.10.3-3.el10_0.1
libwinpr2-2-debuginfo - addressed in versions 2.11.2-150600.4.6.1, 2.11.7-150700.3.3.1
libfreerdp2-2-debuginfo - addressed in versions 2.11.2-150600.4.6.1, 2.11.7-150700.3.3.1
libwinpr2-2 - addressed in versions 2.11.2-150600.4.6.1, 2.11.7-150700.3.3.1
winpr-devel - update to 2.11.2-150600.4.6.1
libfreerdp2-2 - addressed in versions 2.11.2-150600.4.6.1, 2.11.7-150700.3.3.1
freerdp-libs - update to 2.11.7-2.0.1
libwinpr - update to 2.11.7-2.0.1
libwinpr-devel - update to 2.11.7-2.0.1
freerdp-doc - update to 2.11.7-2.0.1
freerdp-devel - update to 2.11.7-2.0.1
freerdp - update to 2.11.7-2.0.1
freerdp2-proxy - update to 2.11.7-150700.3.3.1
freerdp2-devel - update to 2.11.7-150700.3.3.1
freerdp2-server-debuginfo - update to 2.11.7-150700.3.3.1
freerdp2-server - update to 2.11.7-150700.3.3.1
freerdp2 - update to 2.11.7-150700.3.3.1
freerdp2-debuginfo - update to 2.11.7-150700.3.3.1
freerdp2-debugsource - update to 2.11.7-150700.3.3.1
freerdp2-proxy-debuginfo - update to 2.11.7-150700.3.3.1
freerdp-debugsource - update to 2.11.8-1
freerdp - update to 2.11.8-1
freerdp-debuginfo - update to 2.11.8-1
libwinpr-devel - update to 2.11.8-1
libwinpr - update to 2.11.8-1
freerdp-help - update to 2.11.8-1
freerdp-devel - update to 2.11.8-1
freerdp3 (Ubuntu package) - addressed in versions 3.5.1+dfsg1-0ubuntu1.4, 3.16.0+dfsg-2ubuntu0.3

Links to Public Exploits and PoC-codes

External References

Related Security Bulletins