Division by zero in FreeRDP - CVE-2026-31884
Published: April 8, 2026
Vulnerability identifier: #VU125359
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-31884
CWE-ID: CWE-369
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FreeRDP
Affected software:
FreeRDP
FreeRDP
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to division by zero in the MS-ADPCM and IMA-ADPCM decoders in libfreerdp/codec/dsp.c when processing RDPSND audio format negotiation with nBlockAlign set to 0. A remote attacker can send a specially crafted Server Audio Formats PDU followed by a Wave2 PDU to cause a denial of service.
User interaction is required.
How to mitigate CVE-2026-31884
Install security update from vendor's website.