Division by zero in FreeRDP - CVE-2026-63117
Published: July 6, 2026 / Updated: August 21, 2026
Vulnerability identifier: #VU136924
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63117
CWE-ID: CWE-369
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to divide by zero in rdpsnd_server_select_format when processing client-supplied audio format parameters. A remote user can advertise a specially crafted audio format to cause a denial of service.
The issue affects the server-side rdpsnd virtual channel and can result in a SIGFPE.
Affected software
FreeRDP
How to mitigate CVE-2026-63117
Install security update from vendor's website.
FreeRDP - update to 3.28.0