CVE-2026-31806

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0.

Affected products

Freerdp, Red Os, Rocky Linux

Freerdp

< 3.24.0

Fix

Available

CVSS 3.1

9.8 CRITICAL

EPSS

0.7% (48th percentile)

Weakness

CWE-122, CWE-131

NVD status

Modified

Published

2026-03-13

No exploit for CVE-2026-31806 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.