VULNERABILITY INTELLIGENCE

CVE-2026-44421

CVSS score8.8 HIGH
EPSS probability0.51%
CISA KEVNot currently listed
Published2026-05-29
Last modified2026-07-27
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-122
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-787

Primary references