FreeRDP up to 3.23.x libfreerdp/codec/dsp.c nBlockAlign divide by zero

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability was found in FreeRDP up to 3.23.x. It has been declared as problematic. Affected by this issue is some unknown functionality of the file libfreerdp/codec/dsp.c. The manipulation of the argument nBlockAlign results in divide by zero. This vulnerability is known as CVE-2026-31884. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in FreeRDP up to 3.23.x. Affected is some unknown processing of the file libfreerdp/codec/dsp.c. The manipulation of the argument nBlockAlign with an unknown input leads to a divide by zero vulnerability. CWE is classifying the issue as CWE-369. The product divides a value by zero. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-31884 since 03/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 302237 (Linux Distros Unpatched Vulnerability : CVE-2026-31884), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.24.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (302237), EUVD (EUVD-2026-12062) and CERT Bund (WID-SEC-2026-0725). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source FreeRDP

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.1
VulDB Meta Temp Score: 6.0

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 6.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Divide by zero
CWE: CWE-369 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 302237
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31884

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: FreeRDP 3.24.0

Timelineinfo

03/09/2026 CVE reserved
03/13/2026 +4 days Advisory disclosed
03/13/2026 +0 days VulDB entry created
05/13/2026 +61 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-31884 (🔒)
GCVE (CVE): GCVE-0-2026-31884
GCVE (VulDB): GCVE-100-351000
EUVD: 🔒
CERT Bund: WID-SEC-2026-0725 - FreeRDP: Mehrere Schwachstellen

Entryinfo

Created: 03/13/2026 20:16
Updated: 05/13/2026 22:13
Changes: 03/13/2026 20:16 (65), 03/13/2026 20:29 (7), 03/13/2026 20:44 (1), 03/16/2026 06:50 (2), 03/20/2026 10:45 (12), 05/13/2026 22:13 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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