Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-10T19:47:03 FreeRDP: FreeRDP: Remote code execution via heap out-of-bounds write in RemoteFX decoding 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H CWE-787

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clients launched with the non-default /cache:codec:rfx option pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data while allocating bitmap->data only for the smaller DstWidth and DstHeight in gdi_Bitmap_Decompress, allowing a malicious RDP server to trigger a heap out-of-bounds write with attacker-controlled offset and content. This issue is fixed in version 3.27.1.

A flaw was found in FreeRDP. FreeRDP clients using the non-default /cache:codec:rfx option are vulnerable to a heap out-of-bounds write. A malicious Remote Desktop Protocol (RDP) server can exploit this by manipulating desktop stride and height values during RemoteFX decoding for Cache Bitmap V3 data. This can lead to arbitrary code execution on the client system.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Red Hat Enterprise Linux 10 Affected freerdp Red Hat Enterprise Linux 6 Out of support scope freerdp Red Hat Enterprise Linux 7 Out of support scope freerdp Red Hat Enterprise Linux 8 Affected freerdp Red Hat Enterprise Linux 9 Affected freerdp https://www.cve.org/CVERecord?id=CVE-2026-55827 https://nvd.nist.gov/vuln/detail/CVE-2026-55827 https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e https://github.com/FreeRDP/FreeRDP/pull/12899 https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.1 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prp