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CVE-2026-91949

FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass

CVSS 4.0 9.2 CRITICALCVSS 3.1 9.3 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91949

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91949

Published

FreeRDP

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "FreeRDP",
                    "product": "FreeRDP",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "version": "3.0.0",
                            "lessThan": "3.31.0",
                            "status": "affected"
                        },
                        {
                            "versionType": "semver",
                            "version": "3.31.0",
                            "status": "unaffected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON