CVE-2026-68579: FreeRDP Heap Buffer Overflow in Windows Clipboard Client

## Executive Summary A critical heap-based buffer overflow (CVE-2026-68579, CVSS 9.6) was found in FreeRDP's Windows clipboard client (CliprdrStream_Read) allowing oversized reads that can overwrite heap memory when a victim pastes clipboard content from a malicious RDP server; all FreeRDP versions up to 3.29.0 are affected and the issue is fixed in 3.30.0. Mitigation includes upgrading to FreeRDP 3.30.0 or disabling clipboard redirection until patched.