Bug 2519816 (CVE-2026-55648)

Summary:	CVE-2026-55648 FreeRDP: FreeRDP: Integer overflow allows out-of-bounds read via malicious RDP server
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. An integer overflow vulnerability in the `freerdp_image_copy_from_icon_data` function allows a malicious Remote Desktop Protocol (RDP) server to bypass a bounds check. By sending a specially crafted icon update with large dimensions, the server can cause the client to read attacker-controlled data beyond the intended memory buffer. This out-of-bounds read can lead to information disclosure or potentially arbitrary code execution on affected RemoteApp clients.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2521935, 2521937, 2521939
Bug Blocks:

Description OSIDB Bzimport 2026-08-19 17:56:54 UTC

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, freerdp_image_copy_from_icon_data in libfreerdp/codec/color.c calculates nWidth multiplied by nHeight multiplied by FreeRDPGetBytesPerPixel(format) in 32-bit arithmetic. A malicious RDP server can send a RAIL TS_ICON_INFO update with dimensions such as 32768 by 32768 and 32 bits per pixel so the required-size calculation wraps, bypassing the cbBitsColor source bounds check before freerdp_image_copy_no_overlap reads attacker-controlled icon data. This affects RemoteApp clients using the vulnerable library path, while xfreerdp has a caller-side mitigation. This issue is fixed in version 3.27.0.