#VU125349 Use-after-free in FreeRDP - CVE-2026-25953
Published: April 8, 2026
Vulnerability identifier: #VU125349
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-25953
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
FreeRDP
FreeRDP
Software vendor:
FreeRDP
FreeRDP
Description
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 and xf_rail_paint_surface when processing concurrent RDPGFX frame updates and fastpath window-delete orders. A remote attacker can send crafted RDPGFX PDUs and window-delete orders to cause a denial of service and potentially execute arbitrary code.
Exploitation requires a malicious RDP server to win a race between the DVC thread handling EndFrame updates and the main thread deleting the mapped window.
Remediation
Install security update from vendor's website.