CVE-2026-29774

published 2026-03-13

CVE-2026-29774: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a client-side heap buffer overflow occurs in the FreeRDP client's…

Priority P3 48 high 8.2 CVSS 3.1

AV N AC L PR N UI N S U C N I L A H

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a client-side heap buffer overflow occurs in the FreeRDP client's AVC420/AVC444 YUV-to-RGB conversion path due to missing horizontal bounds validation of H.264 metablock regionRects coordinates. In yuv.c, the clamp() function (line 347) only validates top/bottom against the surface/YUV height, but never checks left/right against the surface width. When avc420_yuv_to_rgb (line 67) computes destination and source pointers using rect->left, it performs unchecked pointer arithmetic that can reach far beyond the allocated surface buffer. A malicious server sends a WIRE_TO_SURFACE_PDU_1 with AVC420 codec containing a regionRects entry where left greatly exceeds the surface width (e.g., left=60000 on a 128px surface). The H.264 bitstream decodes successfully, then yuv420_process_work_callback calls avc420_yuv_to_rgb which computes pDstPoint = pDstData + rect->top * nDstStep + rect->left * 4, writing 16-byte SSE vectors 1888+ bytes past the allocated heap region. This vulnerability is fixed in 3.24.0.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
debian	freerdp2	< freerdp3 3.24.0+dfsg-1 (forky)	freerdp3 3.24.0+dfsg-1 (forky)
debian	freerdp3	< freerdp3 3.24.0+dfsg-1 (forky)	freerdp3 3.24.0+dfsg-1 (forky)
freerdp	freerdp	< 3.24.0	3.24.0

CVSS provenance

nvd v3.1 8.2 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

osv 8.2 HIGH

vendor_debian 5.3 MEDIUM

vendor_redhat 5.3 MEDIUM

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CWE-787