CVE-2026-67297
Description
A vulnerability in FreeRDP allows a malicious RD Gateway to bypass client-side size limits by sending oversized chunked HTTP responses. This exhausts the client's memory, resulting in a Denial of Service (DoS).
Statement
A Moderate vulnerability in FreeRDP 3.x allows a malicious or compromised Remote Desktop Gateway to exhaust client memory by sending oversized chunked HTTP responses that bypass the 64 MiB size cap. This flaw affects FreeRDP 3.x clients connecting to untrusted endpoints; RHEL 9 and older releases ship earlier FreeRDP versions that lack this code path and are not affected.
Mitigation
To mitigate this issue, FreeRDP clients should only connect to trusted Remote Desktop Gateway endpoints. Avoiding connections to untrusted or potentially compromised gateways will prevent exposure to malicious servers that could exploit this vulnerability by sending oversized chunked HTTP responses.
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 | 6.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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