Bug 2499227

Summary: CVE-2026-55827 freerdp2: FreeRDP: Remote code execution via heap out-of-bounds write in RemoteFX decoding [fedora-all]
Product: [Fedora] Fedora Reporter: Jon Moroney <jmoroney>
Component: freerdp2Assignee: Neal Gompa <ngompa13>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: negativo17, ngompa13, oholy, tdawson
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["6d21799b-0649-4d55-83e1-0482a86fd42c"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
Last Closed: 2026-07-13 11:25:50 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2499159    

Description Jon Moroney 2026-07-10 21:17:06 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Ondrej Holy 2026-07-13 11:25:50 UTC 
The RFX codec dispatch and rfx_process_message call in gdi_Bitmap_Decompress do not exist in the 2.x codebase.