Use-after-free in FreeRDP - #VU129581
Published: May 4, 2026
Vulnerability identifier: #VU129581
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service and potentially execute arbitrary code.
The vulnerability exists due to use-after-free in the drdynvc client channel callback handling in channels/drdynvc/client/drdynvc_main.c when processing concurrent DYNVC_DATA and server-driven DYNVC_CLOSE messages on the same dynamic virtual channel. A remote attacker can send specially crafted dynamic virtual channel messages to cause a denial of service and potentially execute arbitrary code.
The issue is reachable when a FreeRDP client connects to a malicious or compromised RDP server, and drdynvc is enabled by default.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.22.0