#VU125351 Use-after-free in FreeRDP - CVE-2026-25954
Published: April 8, 2026
Vulnerability identifier: #VU125351
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-2026-25954
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_rail_server_local_move_size when processing RAIL ServerLocalMoveSize PDUs concurrently with window delete orders. A remote attacker can send a sequence of crafted RAIL messages to cause a denial of service and potentially execute arbitrary code.
The issue is triggered by a race condition between the RAIL channel thread and the main thread in the X11 client.
Remediation
Install security update from vendor's website.