Bug 2533968 (CVE-2026-91961)

Summary: CVE-2026-91961 FreeRDP: FreeRDP: Denial of Service via URBDRC control-transfer request with invalid OutputBufferSize
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
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. A malicious Remote Desktop Protocol (RDP) server can send a Universal Serial Bus (USB) Redirection for Remote Desktop Connection (URBDRC) control-transfer request with an invalid OutputBufferSize. This can trigger an assertion in the client process, leading to a denial of service where the client application terminates unexpectedly.
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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: 2534088, 2534089    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-15 15:52:19 UTC
FreeRDP before 3.31.0 contains a denial-of-service vulnerability in the URBDRC control-transfer request path that fails to validate OutputBufferSize before forwarding to the libusb backend. A malicious RDP server can send a control-transfer request with OutputBufferSize set to 65536, triggering a reachable assertion that terminates the client process.