CVE-2026-40033

FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory. The vulnerability occurs because rectangle validation clamps coordinates to UINT16_MAX but performs copy operations using unclamped cache entry dimensions, enabling malicious RDP servers to trigger large out-of-bounds writes and potentially achieve remote code execution or client crash.

Affected products

Freerdp, Red Os

Freerdp

< 3.26.0

Fix

Available

CVSS 3.1

8.8 HIGH

EPSS

1.0% (61th percentile)

Weakness

CWE-787, CWE-122

NVD status

Modified

Published

2026-05-26

No exploit for CVE-2026-40033 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.