Bug 2565935 (CVE-2026-121401)

Summary: CVE-2026-121401 freerdp: FreeRDP: Denial of Service via unexpected RD Gateway extended authentication packet
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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 or compromised Remote Desktop (RD) Gateway can cause a Denial of Service (DoS) by sending an unexpected extended-authentication packet prior to tunnel authentication. Due to missing verification of the negotiated authentication context, processing this packet triggers a null-pointer dereference that crashes the client 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: 2566781, 2566782    
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Description OSIDB Bzimport 2026-11-03 16:34:23 UTC
FreeRDP before 3.32.2 contains a denial of service vulnerability where rdg_process_packet dispatches a PKT_TYPE_EXTENDED_AUTH_MSG without verifying negotiated mode or auth context. A malicious or compromised RD Gateway can send the extended-auth packet before tunnel authentication, triggering a null-pointer dereference that crashes the client.