FreeRDP up to 3.22.x xf_AppUpdateWindowFromSurface use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in FreeRDP up to 3.22.x. This affects the function xf_AppUpdateWindowFromSurface. The manipulation leads to use after free. This vulnerability is referenced as CVE-2026-25955. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in FreeRDP up to 3.22.x and classified as critical. This issue affects the function xf_AppUpdateWindowFromSurface. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is availability. The summary by CVE is:

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_AppUpdateWindowFromSurface` reuses a cached `XImage` whose `data` pointer references a freed RDPGFX surface buffer, because `gdi_DeleteSurface` frees `surface->data` without invalidating the `appWindow->image` that aliases it. Version 3.23.0 fixes the issue.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-25955 since 02/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 300148 (Linux Distros Unpatched Vulnerability : CVE-2026-25955), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.23.0 eliminates this vulnerability. Applying the patch 169d358734509e82663a0d6a0085ae726d439d8e is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (300148) and CERT Bund (WID-SEC-2026-0514). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora 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: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
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: 300148
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-25955

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: FreeRDP 3.23.0
Patch: 169d358734509e82663a0d6a0085ae726d439d8e

Timelineinfo

02/09/2026 CVE reserved
02/26/2026 +17 days Advisory disclosed
02/26/2026 +0 days VulDB entry created
05/13/2026 +76 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-4g54-x8v7-559x
Status: Confirmed

CVE: CVE-2026-25955 (🔒)
GCVE (CVE): GCVE-0-2026-25955
GCVE (VulDB): GCVE-100-347855
CERT Bund: WID-SEC-2026-0514 - FreeRDP: Mehrere Schwachstellen

Entryinfo

Created: 02/26/2026 01:16
Updated: 05/13/2026 22:29
Changes: 02/26/2026 01:16 (70), 02/26/2026 19:53 (7), 03/01/2026 04:23 (13), 03/02/2026 12:28 (2), 05/13/2026 22:29 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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