Use-after-free in FreeRDP - CVE-2026-121408
Published: November 10, 2026 / Updated: November 11, 2026
Vulnerability identifier: #VU164441
CSH Severity: Medium
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-121408
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 by crashing a FreeRDP client.
The vulnerability exists due to use-after-free in the USB redirection control channel when an unreferenced channel pointer outlives a concurrent close operation and is subsequently used for a write. A remote attacker can operate a malicious RDP server and time a CLOSE_REQUEST between channel lookup and write while a connected client with /usb enabled announces a matching local USB device to trigger access to freed memory and potentially crash the client.
Affected software
FreeRDP
How to mitigate CVE-2026-121408
Install security update from vendor's website.
FreeRDP - update to 3.32.2