Use-after-free in FreeRDP - CVE-2026-67299
Published: July 16, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU137835
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-2026-67299
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use-after-free in the async update message proxy for WINDOW_ICON_ORDER when processing crafted RAIL Window Alternate Secondary Orders with WINDOW_ORDER_ICON. A remote attacker can send a specially crafted RDP update order to cause a denial of service.
Exploitation requires AsyncUpdate to be enabled on the client.
Affected software
FreeRDP
How to mitigate CVE-2026-67299
Install security update from vendor's website.
FreeRDP - update to 3.29.0