CVE-2026-110834

A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can cause a Denial of Service (DoS) by sending read or write requests for a redirected serial device before the device is opened or after it has been closed. Because FreeRDP does not verify that the serial communication handle is active before handling these requests, it encounters a null pointer dereference (an attempt to access invalid memory), causing the client application to terminate abruptly.

This flaw is rated Moderate because a malicious or compromised RDP server can crash the FreeRDP client when out-of-lifecycle serial redirection requests is used, causing a denial of service for the connecting user. Exploitation requires the user to initiate a connection (UI:R). Confidentiality and integrity are not impacted. Red Hat platform safeguards such as ASLR, NX, and FORTIFY_SOURCE do not remove the crash impact, so Availability remains High.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Restrict FreeRDP clients to trusted RDP servers and networks.