Race condition in FreeRDP - #VU164444
Published: November 10, 2026
Vulnerability identifier: #VU164444
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to exhaust client memory and cause a denial of service.
The vulnerability exists due to a reference-count race in FreeRDP's asynchronous RDPDR IRP processing when worker threads concurrently release the same input wStream using non-atomic decrements. A remote attacker can operate a malicious RDP server and repeatedly send IRPs through asynchronous redirected-device paths, including smartcard redirection, to accumulate streams and backing buffers that remain allocated until connection teardown.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.33.0