CVE-2026-31883
Medium · 6.5CVSS
6.5
EPSS
0.3%
Published
Mar 13, 2026
CISA due date
—
The record
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a size_t underflow in the IMA-ADPCM and MS-ADPCM audio decoders leads to heap-buffer-overflow write via the RDPSND audio channel. In libfreerdp/codec/dsp.c, the IMA-ADPCM and MS-ADPCM decoders subtract block header sizes from a size_t variable without checking for underflow. When nBlockAlign (received from the server) is set such that size % block_size == 0 triggers the header parsing at a point where size is smaller than the header (4 or 8 bytes), the subtraction wraps size to ~SIZE_MAX. The while (size > 0) loop then continues for an astronomical number of iterations. This vulnerability is fixed in 3.24.0.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| SUSE:Linux Enterprise Module for Package Hub 15 SP7 | freerdp | 0 | 2.11.2-150600.4.18.1 |
| openSUSE:Leap 15.6 | freerdp | 0 | 2.11.2-150600.4.18.1 |
| openSUSE:Tumbleweed | freerdp | 0 | 3.24.1-1.1 |
| openSUSE:Tumbleweed | freerdp2 | 0 | 2.11.7-6.1 |
Related vulnerabilities
- CVE-2026-31885 FreeRDP is a free implementation of the Remote Desktop Protocol. Also affects freerdp
- CVE-2026-31806 FreeRDP is a free implementation of the Remote Desktop Protocol. Also affects freerdp
- CVE-2026-26965 FreeRDP is a free implementation of the Remote Desktop Protocol. Also affects freerdp
- CVE-2026-26271 FreeRDP is a free implementation of the Remote Desktop Protocol. Also affects freerdp
- CVE-2026-26955 FreeRDP is a free implementation of the Remote Desktop Protocol. Also affects freerdp
- CVE-2026-24684 FreeRDP is a free implementation of the Remote Desktop Protocol. Also affects freerdp
- CVE-2026-24682 FreeRDP is a free implementation of the Remote Desktop Protocol. Also affects freerdp
- CVE-2026-24678 FreeRDP is a free implementation of the Remote Desktop Protocol. Also affects freerdp