CVE-2026-44421

High

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

SeverityHigh

CVSS8.8

Exploit probability—

ProductFreerdp

PublishedMay 29, 2026

First seenMay 29, 2026

Weakness typeCWE-122CWE-122

How to fix

Update

freerdp freerdp3.26.0 or later

Vendor advisories

Affected products

Product	Affected versions	Fixed in
freerdp freerdp	v < 3.26.0	3.26.0

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