CVE-2026-91961

A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can send a Universal Serial Bus (USB) Redirection for Remote Desktop Connection (URBDRC) control-transfer request with an invalid OutputBufferSize. This can trigger an assertion in the client process, leading to a denial of service where the client application terminates unexpectedly.

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.

To mitigate this issue, users should only connect to trusted RDP servers. Additionally, running the FreeRDP client within a sandboxed environment can help limit the potential impact of such vulnerabilities.