CVE-2026-91948: Freerdp

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in server-side static virtual channel handling when CHANNEL_OPTION_SHOW_PROTOCOL is enabled. Authenticated clients can queue oversized channel messages that cause buffer underflow and corrupt heap memory including live pointers, potentially enabling code execution.

Affected products

• Freerdp Freerdp: from 3.28.0, before 3.31.0 (fixed in 3.31.0)

Published 2026-09-15. Last modified 2026-09-17.