FreeRDP up to 3.20.0 race condition

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in FreeRDP up to 3.20.0. Impacted is an unknown function. This manipulation causes race condition. This vulnerability is tracked as CVE-2026-22856. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in FreeRDP up to 3.20.0. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race in the serial channel IRP thread tracking allows a heap use‑after‑free when one thread removes an entry from serial->IrpThreads while another reads it. This vulnerability is fixed in 3.20.1.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-22856 since 01/12/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 297418 (SUSE SLED15 / SLES15 Security Update : freerdp (SUSE-SU-2026:0345-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.20.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the databases at Tenable (297418), EUVD (EUVD-2026-2671) and CERT Bund (WID-SEC-2026-0111). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu 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: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 8.1
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
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: 297418
Nessus Name: SUSE SLED15 / SLES15 Security Update : freerdp (SUSE-SU-2026:0345-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: FreeRDP 3.20.1

Timelineinfo

01/12/2026 CVE reserved
01/14/2026 +2 days Advisory disclosed
01/14/2026 +0 days VulDB entry created
06/11/2026 +148 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-w842-c386-fxhv
Status: Confirmed

CVE: CVE-2026-22856 (🔒)
GCVE (CVE): GCVE-0-2026-22856
GCVE (VulDB): GCVE-100-341137
EUVD: 🔒
CERT Bund: WID-SEC-2026-0111 - FreeRDP: Mehrere Schwachstellen

Entryinfo

Created: 01/14/2026 21:30
Updated: 06/11/2026 02:49
Changes: 01/14/2026 21:30 (67), 01/15/2026 07:41 (1), 01/17/2026 10:21 (1), 01/21/2026 05:48 (11), 01/31/2026 18:33 (2), 02/26/2026 10:05 (7), 06/11/2026 02:49 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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