Bug 2533925 (CVE-2026-91949) - CVE-2026-91949 freerdp: FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass
Summary: CVE-2026-91949 freerdp: FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass
Keywords:
Status: NEW
Alias: CVE-2026-91949
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2537354
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-15 15:51 UTC by OSIDB Bzimport
Modified: 2026-09-21 10:26 UTC (History)
2 users (show)

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

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-09-15 15:51:14 UTC 
FreeRDP server versions before 3.31.0 contain a protocol negotiation bypass vulnerability that allows unauthenticated attackers to establish RDSTLS connections despite server policy disabling them. Attackers can send incompatible protocol requests, receive negotiation failures, then complete TLS handshake and enter RDSTLS to bypass pre-authentication transport restrictions.
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