CVE-2026-56297: Freerdp

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service.

Affected products

• Freerdp Freerdp: before 3.22.0 (fixed in 3.22.0)

Published 2026-07-08. Last modified 2026-07-10.