Use-after-free in FreeRDP - CVE-2026-67300
Published: July 16, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU137836
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-67300
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 or disclose sensitive information.
The vulnerability exists due to use-after-free in the async update message proxy for RAIL WINDOW_STATE_ORDER handling when processing crafted update orders from an RDP server with AsyncUpdate enabled. A remote attacker can send crafted update orders to cause a denial of service or disclose sensitive information.
Only clients with AsyncUpdate enabled are vulnerable.
Affected software
FreeRDP
How to mitigate CVE-2026-67300
Install security update from vendor's website.
FreeRDP - update to 3.29.0