CVE-2026-91961: Freerdp

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

FreeRDP before 3.31.0 contains a denial-of-service vulnerability in the URBDRC control-transfer request path that fails to validate OutputBufferSize before forwarding to the libusb backend. A malicious RDP server can send a control-transfer request with OutputBufferSize set to 65536, triggering a reachable assertion that terminates the client process.

Affected products

• Freerdp Freerdp: before 3.31.0 (fixed in 3.31.0)

Published 2026-09-15. Last modified 2026-09-23.