Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-01T12:22:16 FreeRDP: FreeRDP: Memory disclosure or denial of service via crafted RDP update orders 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H CWE-125

FreeRDP before 3.29.0 contains out-of-bounds read vulnerabilities in the async update message proxy for the PolygonSC and PolygonCB primary drawing orders. When AsyncUpdate is enabled (e.g., xfreerdp /async-update), update_message_PolygonSC() and update_message_PolygonCB() allocate a fresh points array but copy point data from the address of the order structure instead of from polygonSC->points / polygonCB->points, resulting in a client-side out-of-bounds read. A malicious or compromised RDP server sending crafted PolygonSC/PolygonCB update orders can trigger memory disclosure or a client crash.

A flaw was found in FreeRDP. When the `async-update` feature is enabled, a malicious or compromised Remote Desktop Protocol (RDP) server can send specially crafted update orders. This can lead to an out-of-bounds read, potentially exposing sensitive information or causing the client application to crash, resulting in a Denial of Service.

A Moderate out-of-bounds read flaw in FreeRDP allows a malicious server to cause memory disclosure or crash the client, but only when the non-default async-update feature is explicitly enabled. To mitigate this issue, avoid enabling the `async-update` feature when using FreeRDP clients. This feature is not enabled by default. If `xfreerdp` is used, ensure the `/async-update` command-line option is not specified. Disabling this feature may impact performance in certain RDP sessions where asynchronous updates are beneficial. Red Hat Enterprise Linux 10 Affected freerdp Red Hat Enterprise Linux 6 Not affected freerdp Red Hat Enterprise Linux 7 Affected freerdp Red Hat Enterprise Linux 8 Affected freerdp Red Hat Enterprise Linux 9 Affected freerdp https://www.cve.org/CVERecord?id=CVE-2026-67301 https://nvd.nist.gov/vuln/detail/CVE-2026-67301 https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vxp3-7g6q-rq2w https://www.vulncheck.com/advisories/freerdp-before-out-of-bounds-read-via-polygon-async-message-proxy