CVE-2026-22856: Freerdp

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race in the serial channel IRP thread tracking allows a heap use‑after‑free when one thread removes an entry from serial->IrpThreads while another reads it. This vulnerability is fixed in 3.20.1.

Affected products

• Freerdp Freerdp: before 3.20.1 (fixed in 3.20.1)

Published 2026-01-14. Last modified 2026-06-17.