CVE-2026-31884

published 2026-03-13

CVE-2026-31884: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, division by zero in MS-ADPCM and IMA-ADPCM decoders when nBlockAlign is 0…

Priority P3 40 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, division by zero in MS-ADPCM and IMA-ADPCM decoders when nBlockAlign is 0, leading to a crash. In libfreerdp/codec/dsp.c, both ADPCM decoders use size % block_size where block_size = context->common.format.nBlockAlign. The nBlockAlign value comes from the Server Audio Formats PDU on the RDPSND channel. The value 0 is not validated anywhere before reaching the decoder. When nBlockAlign = 0, the modulo operation causes a SIGFPE (floating point exception) crash. This vulnerability is fixed in 3.24.0.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
debian	freerdp2	< freerdp3 3.24.0+dfsg-1 (forky)	freerdp3 3.24.0+dfsg-1 (forky)
debian	freerdp3	< freerdp3 3.24.0+dfsg-1 (forky)	freerdp3 3.24.0+dfsg-1 (forky)
freerdp	freerdp	< 3.24.0	3.24.0

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

osv 7.5 HIGH

vendor_debian 6.5 MEDIUM

vendor_redhat 6.5 MEDIUM

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CWE-369