Heap-based buffer overflow in FreeRDP - CVE-2026-44421
Published: May 12, 2026
Vulnerability identifier: #VU131104
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44421
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in gdi_CacheToSurface when processing crafted RDPGFX PDUs from a server. A remote attacker can send crafted RDPGFX CacheToSurface messages to execute arbitrary code.
RDPGFX must be enabled, and user interaction is required to connect the client to an attacker-controlled RDP server.
Affected software
FreeRDP
How to mitigate CVE-2026-44421
Install security update from vendor's website.
FreeRDP - update to 3.26.0