CVE-2026-110833
Description
A flaw was found in FreeRDP. The proxy component fails to enforce cumulative or absolute size limits when reassembling Remote Desktop Protocol Device Redirection (RDPDR) channel fragments. A remote attacker can exploit this vulnerability by transmitting an initial fragment followed by continuous data fragments without a termination marker, causing unbounded memory retention in the proxy session. This excessive memory consumption can ultimately lead to a Denial of Service (DoS).
Statement
This vulnerability is rated as Moderate severity because exploitation requires an established session with device redirection and a proxy explicitly configured to intercept RDPDR channel traffic, resulting in resource exhaustion without compromising data integrity, confidentiality, or allowing arbitrary code execution. In standard Red Hat deployments, FreeRDP is predominantly utilized as a client application or library rather than an intermediary proxy service. Consequently, typical environments are not exposed to this issue unless the proxy is actively deployed with channel interception enabled. Furthermore, Red Hat Enterprise Linux 8 and 9 are unaffected because they provide earlier FreeRDP versions lacking the vulnerable proxy code.
Mitigation
Limit FreeRDP process resources with ulimit/cgroup controls to contain memory exhaustion. Restrict clients/servers to trusted peers.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.9 | 7.5 | 5.9 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | Low | High |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| 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:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat CVSS v3 Score Explanation
In standard Red Hat deployments, FreeRDP is predominantly utilized as a client application or library rather than an intermediary proxy service. Consequently, typical environments are not exposed to this issue unless the proxy is actively deployed with channel interception enabled.
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
If an attacker can trigger the allocation of the limited resources, but the number or size of the resources is not controlled, then the most common result is denial of service. This would prevent valid users from accessing the product, and it could potentially have an impact on the surrounding environment, i.e., the product may slow down, crash due to unhandled errors, or lock out legitimate users. For example, a memory exhaustion attack against an application could slow down the application as well as its host operating system.
Access Control,Other
Technical Impact: Bypass Protection Mechanism; Other
In some cases it may be possible to force the product to "fail open" in the event of resource exhaustion. The state of the product -- and possibly the security functionality - may then be compromised.
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