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.
History

Tue, 26 May 2026 14:30:00 +0000

Type Values Removed Values Added
Description 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.
Title FreeRDP - Heap-buffer-overflow in gdi_CacheToSurface via rectangle validation bypass
First Time appeared Freerdp
Freerdp freerdp
Weaknesses CWE-122
CPEs cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Vendors & Products Freerdp
Freerdp freerdp
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-26T15:21:18.084Z

Reserved: 2026-04-08T13:36:55.304Z

Link: CVE-2026-40033

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-26T15:16:34.480

Modified: 2026-05-26T15:16:34.480

Link: CVE-2026-40033

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-26T15:30:08Z