Allocation of Resources Without Limits or Throttling in FreeRDP - CVE-2026-121405
Published: November 10, 2026 / Updated: November 11, 2026
Vulnerability identifier: #VU164436
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-121405
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to exhaust FreeRDP client memory and cause a denial of service.
The vulnerability exists due to unbounded allocation and incorrect use of BytesReturned after IOCTL failure in FreeRDP's serial device-control handler and WinPR when processing server requests. A remote attacker can induce a client connection with serial redirection enabled and, after successfully opening a redirected serial device, send an IRP_MJ_DEVICE_CONTROL request with IOCTL_USBPRINT_GET_1284_ID and OutputBufferLength=0xFFFFFFFF to trigger excessive memory consumption.
Affected software
FreeRDP
How to mitigate CVE-2026-121405
Install security update from vendor's website.
FreeRDP - update to 3.32.2