Bug 2550540 (CVE-2026-109952)

Summary: CVE-2026-109952 freerdp: FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Response
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 remote attacker, acting as a malicious server or an on-path attacker, can exploit this flaw to cause information disclosure by intercepting user credentials in cleartext. Due to missing validation during connection negotiation, the client accepts unapproved security protocols selected by the server, bypassing configured protections like Network Level Authentication (NLA). Consequently, the connection downgrades to a less secure protocol and transmits the user's password in plain text.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2562585    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-13 13:59:38 UTC 
The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in nego_process_negotiation_response(), allowing a security protocol downgrade. A malicious server or man-in-the-middle can select RDSTLS to override /sec:nla pinning, complete authentication with an all-zero cookie, and receive the user's cleartext password in the Client Info PDU.