Heap-based buffer overflow in FreeRDP - CVE-2026-67305
Published: July 16, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU137843
CSH Severity: Medium
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-67305
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in the FreeRDP Windows client clipboard virtual channel handling in wfreerdp when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs from a server. A remote user can send a specially crafted clipboard file contents response to execute arbitrary code.
User interaction is required to connect to a malicious RDP server and perform a paste operation in Windows Explorer, and clipboard redirection must be enabled.
Affected software
FreeRDP
How to mitigate CVE-2026-67305
Install security update from vendor's website.
FreeRDP - update to 3.29.0