Use-after-free in FreeRDP - CVE-2026-25955

Vulnerability identifier: #VU125348

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-25955

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_AppUpdateWindowFromSurface when processing crafted RDPGFX surface updates from a malicious server. A remote attacker can send crafted surface create, delete, and repaint sequences to cause a denial of service and potentially execute arbitrary code.

Exploitation requires a client connection to a malicious RDP server with RAIL and RDPGFX support, and the issue is triggered in the X11 client with SoftwareGdi enabled.

FreeRDP
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Package Hub 15
Ubuntu
Fedora
freerdp3 (Ubuntu package)
freerdp
libwinpr3-3
freerdp-sdl
librdtk0-0-debuginfo
freerdp-proxy-plugins-debuginfo
libwinpr3-3-debuginfo
winpr-devel
libfreerdp-server-proxy3-3-debuginfo
libfreerdp-server-proxy3-3
freerdp-proxy-plugins
freerdp-sdl-debuginfo
librdtk0-0
libfreerdp3-3-debuginfo
libfreerdp3-3
freerdp-server
freerdp-devel
libuwac0-0-debuginfo
freerdp-debugsource
libuwac0-0
freerdp-server-debuginfo
freerdp-debuginfo
freerdp-wayland
freerdp-proxy-debuginfo
freerdp-proxy
freerdp-wayland-debuginfo

Install security update from vendor's website.

FreeRDP - update to 3.23.0
freerdp3 (Ubuntu package) - addressed in versions 3.5.1+dfsg1-0ubuntu1.4, 3.16.0+dfsg-2ubuntu0.3
freerdp - update to 3.10.3-150700.3.14.1
libwinpr3-3 - update to 3.10.3-150700.3.14.1
freerdp-sdl - update to 3.10.3-150700.3.14.1
librdtk0-0-debuginfo - update to 3.10.3-150700.3.14.1
freerdp-proxy-plugins-debuginfo - update to 3.10.3-150700.3.14.1
libwinpr3-3-debuginfo - update to 3.10.3-150700.3.14.1
winpr-devel - update to 3.10.3-150700.3.14.1
libfreerdp-server-proxy3-3-debuginfo - update to 3.10.3-150700.3.14.1
libfreerdp-server-proxy3-3 - update to 3.10.3-150700.3.14.1
freerdp-proxy-plugins - update to 3.10.3-150700.3.14.1
freerdp-sdl-debuginfo - update to 3.10.3-150700.3.14.1
librdtk0-0 - update to 3.10.3-150700.3.14.1
libfreerdp3-3-debuginfo - update to 3.10.3-150700.3.14.1
libfreerdp3-3 - update to 3.10.3-150700.3.14.1
freerdp-server - update to 3.10.3-150700.3.14.1
freerdp-devel - update to 3.10.3-150700.3.14.1
libuwac0-0-debuginfo - update to 3.10.3-150700.3.14.1
freerdp-debugsource - update to 3.10.3-150700.3.14.1
libuwac0-0 - update to 3.10.3-150700.3.14.1
freerdp-server-debuginfo - update to 3.10.3-150700.3.14.1
freerdp-debuginfo - update to 3.10.3-150700.3.14.1
freerdp-wayland - update to 3.10.3-150700.3.14.1
freerdp-proxy-debuginfo - update to 3.10.3-150700.3.14.1
freerdp-proxy - update to 3.10.3-150700.3.14.1
freerdp-wayland-debuginfo - 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-4g54-x8v7-559x

• Multiple vulnerabilities in FreeRDP
• Fedora 42 update for freerdp
• Fedora 44 update for freerdp
• Fedora 43 update for freerdp
• Ubuntu update for freerdp3
• SUSE update for freerdp