VDB
DEBIAN-CVE-2026-31883
DEBIAN-CVE-2026-31883
PUBLISHED
CVSS 9.800000190734863 CRITICAL
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.
Risk Scores
CVSS v3.1
9.800000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:14 | freerdp3 | 3.15.0+dfsg-2.1, 3.16.0+dfsg-1, 3.17.0+dfsg-1 |
| Debian:12 | freerdp2 | 0, 2.10.0+dfsg1-1, 2.10.0+dfsg1-1.1 |
| Debian:13 | freerdp3 | 3.15.0+dfsg, 3.15.0+dfsg-2.1, 3.16.0+dfsg-1 |
| Debian:11 | freerdp2 | 2.10.0+dfsg1, 2.10.0+dfsg1, 2.10.0+dfsg1 |
Timeline
- Mar 13, 2026 CVE Published
- May 16, 2026 CVE Updated