CVE-2026-67303
Fixed in a distro release EPSS <1%CVSS 4.3
FreeRDP before 3.29.0 contains a reachable assertion (WINPR_ASSERT(OutputBufferLength == BytesReturned)) in serial_process_irp_device_control() in channels/serial/client/serial_main.c. When serial device redirection is enabled and a server-controlled IRP_MJ_DEVICE_CONTROL request specifies an unsupported IOCTL with a non-zero OutputBufferLength, CommDeviceIoControl() can fail with BytesReturned = 0, causing the mismatch to trigger the assertion and abort the client process (denial of service).
Products: FreeRDP
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux 2023 | freerdp | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | freerdp-devel | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | freerdp-libs | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | freerdp-server | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | libwinpr | 2:3.6.3-1.amzn2023.0.15 |
| Amazon Linux 2023 | libwinpr-devel | 2:3.6.3-1.amzn2023.0.15 |
| Debian 12 | freerdp2 | no fix |
| Debian 13 | freerdp3 | no fix |
| Debian 14 | freerdp3 | 3.29.0+dfsg-1 |
| Ubuntu 16.04 LTS | freerdp | no fix |
| Ubuntu 18.04 LTS | freerdp | no fix |
| Ubuntu 22.04 LTS | freerdp2 | no fix |
| Ubuntu 24.04 LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 |
| Ubuntu 26.04 LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.26.04.1 |
| Ubuntu Pro 18.04 LTS | freerdp2 | no fix |
| Ubuntu Pro 20.04 LTS | freerdp2 | no fix |
| Ubuntu Pro 24.04 LTS | freerdp2 | no fix |