Protection Mechanism Failure Affecting freerdp/freerdp package, versions [3.0.0,3.31.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-FREERDPFREERDP-21192052
- published18 Oct 2026
- disclosed15 Sept 2026
- creditUnknown
Introduced: 15 Sep 2026
CVE-2026-91949 (opens in a new tab)How to fix?
Upgrade freerdp/freerdp to version 3.31.0 or higher.
Overview
Affected versions of this package are vulnerable to Protection Mechanism Failure in the protocol negotiation process. An attacker can gain unauthorized access by sending incompatible protocol requests, receiving negotiation failures, and then completing a TLS handshake to enter RDSTLS, thereby bypassing pre-authentication transport restrictions.