CVE-2026-56297

High

Description

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.

SeverityHigh

CVSS7.0

Exploit probability—

ProductFreerdp

PublishedJul 8, 2026

First seenJul 8, 2026

Weakness typeCWE-362Race condition

How to fix

Update

freerdp freerdp3.22.0 or later

Vendor advisories

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h

Affected products

Product	Affected versions	Fixed in
freerdp freerdp	v < 3.22.0	3.22.0

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