CVE-2026-63117
Medium
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP client can advertise DVI ADPCM with nBlockAlign equal to 8 and nChannels equal to 2 to make the `bs` calculation in rdpsnd_server_select_format in channels/rdpsnd/server/rdpsnd_main.c equal zero. The subsequent out_frames modulo `bs` operation raises SIGFPE and terminates the server-side rdpsnd channel process. This vulnerability fixed in 3.28.0.
SeverityMedium
CVSS6.5
Exploit probability—
ProductFreerdp
PublishedAug 19, 2026
First seenAug 19, 2026
Weakness typeCWE-369CWE-369
How to fix
Update
- freerdp freerdp3.28.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| freerdp freerdp | v < 3.28.0 | 3.28.0 |
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