CVE-2026-109676

A flaw was found in FreeRDP. When a user connects to a malicious Remote Desktop Protocol (RDP) server, the server can trigger an invalid smartcard connect operation, leading to a use-after-free vulnerability where previously released memory is accessed. A remote attacker can exploit this issue to cause memory corruption, potentially leading to arbitrary code execution or a Denial of Service (DoS) through an application crash.

This flaw is rated Important because a malicious RDP peer can trigger memory corruption in the FreeRDP client after the user connects (UI:R), with potential impact beyond a simple crash. Red Hat heap/allocator hardening and ASLR raise exploitation difficulty but do not justify lowering Confidentiality/Integrity/Availability in the base score when corruption is confirmed. This is the highest-severity issue in this FreeRDP set (CVSS 8.8) but remains Important rather than Critical because exploitation requires the user to connect to a malicious RDP server (UI:R).

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.

If smartcard redirection is not required, disable it on the FreeRDP client. Restrict connections to trusted RDP servers.