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CVE-2026-44421— FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass

CVSS 8.8 · High
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I. Basic Information for CVE-2026-44421

Vulnerability Information
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Vulnerability Title
FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
FreeRDPFreeRDP < 3.26.0 -

II. Public POCs for CVE-2026-44421

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III. Intelligence Information for CVE-2026-44421

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Vendor Advisories for CVE-2026-44421 (1)

Same Patch Batch · FreeRDP · 2026-05-29 · 4 CVEs total

CVE-2026-444208.8 HIGHFreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_
CVE-2026-444227.5 HIGHFreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion
CVE-2026-45700Heap-buffer-overflow write in planar bitmap decoder

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-122

V. Comments for CVE-2026-44421

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