CVE-2026-109952 MEDIUM

CVE-2026-109952: FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Response

Vendor Freerdp
Product FreeRDP
Weakness CWE-757
Published October 13, 2026
Last update October 16, 2026
View on NVD All CVEs

CVSS base score

6.0/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

October 13, 2026 CVE published
October 16, 2026 Record updated