Bug 2481473 (CVE-2026-40033)

Summary: CVE-2026-40033 freerdp: FreeRDP: Remote code execution via heap-buffer-overflow in gdi_CacheToSurface
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.If a user connects to a malicious Remote Desktop (RDP) server, a security flaw in FreeRDP could cause the application to crash or allow the server to run unauthorized code on the user's system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2490294, 2490292, 2490293    
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Description OSIDB Bzimport 2026-05-26 15:01:49 UTC 
FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory. The vulnerability occurs because rectangle validation clamps coordinates to UINT16_MAX but performs copy operations using unclamped cache entry dimensions, enabling malicious RDP servers to trigger large out-of-bounds writes and potentially achieve remote code execution or client crash.