Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-01T12:22:18 FreeRDP: FreeRDP: Out-of-bounds read vulnerability via crafted RDP messages 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L CWE-125

FreeRDP versions 3.28.0 and earlier contain an out-of-bounds read vulnerability in the RDP6 planar RLE bitmap decoder functions planar_decompress_plane_rle and planar_decompress_plane_rle_only in libfreerdp/codec/planar.c. Only the 1-byte control byte is bounds-checked; the subsequent 0–15 attacker-declared raw bytes are read without validating that the source buffer contains them. A malicious or compromised RDP server can send a truncated planar-encoded bitmap or surface update (reachable via both the Bitmap Update PDU and RDPGFX Surface Command paths) that causes the client to read past the end of the source buffer. The issue is fixed in FreeRDP 3.29.0.

A flaw was found in FreeRDP. An out-of-bounds read vulnerability exists in the RDP6 planar RLE bitmap decoder. A malicious or compromised Remote Desktop Protocol (RDP) server can send a specially crafted bitmap or surface update. This can cause the client to read beyond the intended memory buffer, potentially leading to a denial of service (client crash) or the disclosure of sensitive information.

Successful exploitation requires user interaction or specific client connection behavior. An attacker cannot trigger this vulnerability remotely on an arbitrary client system without the client actively initiating an RDP session to a malicious or compromised RDP server. The out-of-bounds read vulnerability is strictly contained within the client application process. It primarily results in an application crash leading to a localized Denial of Service (DoS), or potentially exposing limited client process memory, but it does not enable arbitrary code execution, privilege escalation, or systemic compromise of the host 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 Fix deferred 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 Fix deferred freerdp Red Hat Enterprise Linux 9 Fix deferred freerdp https://www.cve.org/CVERecord?id=CVE-2026-67306 https://nvd.nist.gov/vuln/detail/CVE-2026-67306 https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qrxx-7g3c-j6w3 https://www.vulncheck.com/advisories/freerdp-before-out-of-bounds-read-via-planar-rle