Use-after-free in FreeRDP - CVE-2026-25997

Vulnerability identifier: #VU125355

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-25997

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service and potentially execute arbitrary code.

The vulnerability exists due to use-after-free in xf_clipboard_format_equal when processing clipboard format changes during auto-reconnect. A remote attacker can trigger a client reconnection sequence and concurrent clipboard activity to cause a denial of service and potentially execute arbitrary code.

The issue is client-side and occurs because the cliprdr channel thread frees lastSentFormats while the X11 event thread concurrently iterates it.

FreeRDP
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
SUSE Package Hub 15
openSUSE Leap
openEuler
Ubuntu
Fedora
freerdp-devel
winpr2-devel
libfreerdp2-debuginfo
freerdp-debugsource
uwac0-0-devel
freerdp-server
freerdp-wayland
libuwac0-0-debuginfo
libfreerdp2
libwinpr2
freerdp-wayland-debuginfo
freerdp-proxy
freerdp-debuginfo
libwinpr2-debuginfo
freerdp-server-debuginfo
freerdp-proxy-debuginfo
libuwac0-0
freerdp
libfreerdp2-2
libwinpr2-2-debuginfo
winpr-devel
libwinpr2-2
libfreerdp2-2-debuginfo
freerdp2-proxy
freerdp2-debugsource
freerdp2-debuginfo
freerdp2-proxy-debuginfo
freerdp2-server
freerdp2-server-debuginfo
freerdp2
freerdp2-devel
libwinpr-devel
libwinpr
freerdp-help
freerdp3 (Ubuntu package)
freerdp (Red Hat package)
freerdp-sdl
libfreerdp3-3
libfreerdp3-3-debuginfo
librdtk0-0
freerdp-sdl-debuginfo
freerdp-proxy-plugins
libfreerdp-server-proxy3-3
libfreerdp-server-proxy3-3-debuginfo
libwinpr3-3-debuginfo
freerdp-proxy-plugins-debuginfo
librdtk0-0-debuginfo
libwinpr3-3

Install security update from vendor's website.

FreeRDP - update to 3.23.0
freerdp-devel - addressed in versions 2.1.2-12.68.1, 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
winpr2-devel - addressed in versions 2.1.2-12.68.1, 2.4.0-150400.3.52.1, 2.11.7-150700.3.22.1
libfreerdp2-debuginfo - update to 2.4.0-150400.3.52.1
freerdp-debugsource - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
uwac0-0-devel - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1
freerdp-server - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
freerdp-wayland - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
libuwac0-0-debuginfo - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
libfreerdp2 - update to 2.4.0-150400.3.52.1
libwinpr2 - update to 2.4.0-150400.3.52.1
freerdp-wayland-debuginfo - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
freerdp-proxy - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
freerdp-debuginfo - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
libwinpr2-debuginfo - update to 2.4.0-150400.3.52.1
freerdp-server-debuginfo - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
freerdp-proxy-debuginfo - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
libuwac0-0 - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
freerdp - addressed in versions 2.4.0-150400.3.52.1, 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
libfreerdp2-2 - addressed in versions 2.11.2-150600.4.26.1, 2.11.7-150700.3.22.1
libwinpr2-2-debuginfo - addressed in versions 2.11.2-150600.4.26.1, 2.11.7-150700.3.22.1
winpr-devel - addressed in versions 2.11.2-150600.4.26.1, 3.10.3-150700.3.14.1
libwinpr2-2 - addressed in versions 2.11.2-150600.4.26.1, 2.11.7-150700.3.22.1
libfreerdp2-2-debuginfo - addressed in versions 2.11.2-150600.4.26.1, 2.11.7-150700.3.22.1
freerdp2-proxy - update to 2.11.7-150700.3.22.1
freerdp2-debugsource - update to 2.11.7-150700.3.22.1
freerdp2-debuginfo - update to 2.11.7-150700.3.22.1
freerdp2-proxy-debuginfo - update to 2.11.7-150700.3.22.1
freerdp2-server - update to 2.11.7-150700.3.22.1
freerdp2-server-debuginfo - update to 2.11.7-150700.3.22.1
freerdp2 - update to 2.11.7-150700.3.22.1
freerdp2-devel - update to 2.11.7-150700.3.22.1
freerdp-debuginfo - update to 2.11.8-1
freerdp-devel - update to 2.11.8-1
freerdp-debugsource - update to 2.11.8-1
freerdp - 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
freerdp3 (Ubuntu package) - addressed in versions 3.5.1+dfsg1-0ubuntu1.4, 3.16.0+dfsg-2ubuntu0.3
freerdp (Red Hat package) - update to 3.10.3-5.el10_1.8
freerdp-sdl - update to 3.10.3-150700.3.14.1
libfreerdp3-3 - update to 3.10.3-150700.3.14.1
libfreerdp3-3-debuginfo - update to 3.10.3-150700.3.14.1
librdtk0-0 - update to 3.10.3-150700.3.14.1
freerdp-sdl-debuginfo - update to 3.10.3-150700.3.14.1
freerdp-proxy-plugins - update to 3.10.3-150700.3.14.1
libfreerdp-server-proxy3-3 - update to 3.10.3-150700.3.14.1
libfreerdp-server-proxy3-3-debuginfo - update to 3.10.3-150700.3.14.1
libwinpr3-3-debuginfo - update to 3.10.3-150700.3.14.1
freerdp-proxy-plugins-debuginfo - update to 3.10.3-150700.3.14.1
librdtk0-0-debuginfo - update to 3.10.3-150700.3.14.1
libwinpr3-3 - update to 3.10.3-150700.3.14.1
freerdp - addressed in versions 3.23.0-1.fc42, 3.23.0-1.fc43, 3.23.0-1.fc44

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q5j3-m6jf-3jq4

• Multiple vulnerabilities in FreeRDP
• Fedora 42 update for freerdp
• Fedora 44 update for freerdp
• Fedora 43 update for freerdp
• openEuler 24.03 LTS update for freerdp
• openEuler 22.03 LTS SP4 update for freerdp
• openEuler 20.03 LTS SP4 update for freerdp
• openEuler 24.03 LTS SP3 update for freerdp
• openEuler 24.03 LTS SP2 update for freerdp
• openEuler 24.03 LTS SP1 update for freerdp
• Ubuntu update for freerdp3
• SUSE update for freerdp
• SUSE update for freerdp
• SUSE update for freerdp
• SUSE update for freerdp
• SUSE update for freerdp2
• Red Hat Enterprise Linux 10 update for freerdp