Bug 2552996 (CVE-2026-110839)

Summary: CVE-2026-110839 freerdp: FreeRDP: Denial of Service via grayscale JPEG clipboard conversion
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FreeRDP. This vulnerability allows a malicious Remote Desktop Protocol (RDP) server to cause client memory corruption and a Denial of Service (DoS) by offering a specially crafted grayscale JPEG image through clipboard redirection. When the client converts the image into bitmap data during a paste operation, an incorrect buffer size calculation causes data to be written beyond the allocated heap boundaries, crashing the application.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2553125    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-14 23:04:29 UTC
FreeRDP 3.3.0 before 3.32.0, when built with WINPR_UTILS_IMAGE_JPEG=ON, has a heap-based out-of-bounds write in winpr_convert_from_jpeg because grayscale JPEG buffers are sized from one input component rather than three BGR output components. A malicious RDP server can offer a grayscale JPEG via clipboard redirection, corrupting client memory and crashing it when the item is pasted as CF_DIB bitmap data.