CVE-2026-31884 | THREATINT

Description

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.

PUBLISHED Reserved 2026-03-09 | Published 2026-03-13 | Updated 2026-03-13 | Assigner GitHub_M

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem types

CWE-369: Divide By Zero

Product status

< 3.24.0

affected

References

github.com/...reeRDP/security/advisories/GHSA-jp7m-94ww-p56r

github.com/...ommit/03b48b3601d867afccac1cdc6081de7a275edce7

github.com/...ommit/16df2300e1e3f5a51f68fb1626429e58b531b7c8

cve.org (CVE-2026-31884)

nvd.nist.gov (CVE-2026-31884)

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