Heap Buffer Overflow in FreeRDP Client Affecting Remote Desktop Functionality

CVE-2026-29774

What is CVE-2026-29774?

The FreeRDP client, prior to version 3.24.0, is susceptible to a client-side heap buffer overflow in its AVC420/AVC444 YUV-to-RGB conversion process. This issue stems from insufficient validation of the horizontal bounds in the H.264 metablock regionRects coordinates. When processing a maliciously crafted packet that exceeds surface dimensions, unchecked pointer arithmetic can lead to the writing of data beyond allocated memory, potentially allowing an attacker to execute arbitrary code. The vulnerability has been addressed in version 3.24.0.

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