CVE-2026-67306

A flaw was found in FreeRDP. An out-of-bounds read vulnerability exists in the RDP6 planar RLE bitmap decoder. A malicious or compromised Remote Desktop Protocol (RDP) server can send a specially crafted bitmap or surface update. This can cause the client to read beyond the intended memory buffer, potentially leading to a denial of service (client crash) or the disclosure of sensitive information.

Successful exploitation requires user interaction or specific client connection behavior. An attacker cannot trigger this vulnerability remotely on an arbitrary client system without the client actively initiating an RDP session to a malicious or compromised RDP server.

The out-of-bounds read vulnerability is strictly contained within the client application process. It primarily results in an application crash leading to a localized Denial of Service (DoS), or potentially exposing limited client process memory, but it does not enable arbitrary code execution, privilege escalation, or systemic compromise of the host system

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.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.