Bug 2550540 (CVE-2026-109952) - CVE-2026-109952 freerdp: FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Response
Summary: CVE-2026-109952 freerdp: FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgr...
Keywords:
Status: NEW
Alias: CVE-2026-109952
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2562585
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-13 13:59 UTC by OSIDB Bzimport
Modified: 2026-10-28 07:43 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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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.
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