CVE-2026-109679
Description
A flaw was found in FreeRDP. A malicious or compromised remote desktop gateway can cause a Denial of Service (DoS) by returning a response with an empty body during connection negotiation. When processing the response from an Azure Resource Manager (ARM) endpoint, the client fails to verify that the message body exists, resulting in a NULL pointer dereference. An attacker controlling the configured gateway can exploit this vulnerability to crash the connecting client application.
Statement
This flaw is rated Moderate because a malicious or compromised RDP server can crash the FreeRDP client when RD Gateway handling is used, causing a denial of service for the connecting user. Exploitation requires the user to initiate a connection (UI:R). Confidentiality and integrity are not impacted. Red Hat platform safeguards such as ASLR, NX, and FORTIFY_SOURCE do not remove the crash impact, so Availability remains High.
Mitigation
Avoid connecting through untrusted RD Gateway hosts. Restrict FreeRDP gateway use to trusted infrastructure.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | 5.3 | 5.3 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | High | High |
| Privileges Required | None | None | None |
| User Interaction | Required | Required | Required |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | None |
| Integrity Impact | None | None | None |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Red Hat CVSS v3 Score Explanation
Red Hat CVSS reflects FreeRDP exposure after applying client/server interaction model. Score 5.3 maps to MODERATE.
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