Protection Mechanism Failure Affecting freerdp3 package, versions <3.31.0+dfsg-0ubuntu0.26.04.1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.56% (45th percentile)

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  • Snyk IDSNYK-UBUNTU2604-FREERDP3-19867129
  • published22 Sept 2026
  • disclosed15 Sept 2026

Introduced: 15 Sep 2026

CVE-2026-91949  (opens in a new tab)
CWE-693  (opens in a new tab)

How to fix?

Upgrade Ubuntu:26.04 freerdp3 to version 3.31.0+dfsg-0ubuntu0.26.04.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream freerdp3 package and not the freerdp3 package as distributed by Ubuntu. See How to fix? for Ubuntu:26.04 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1