CVE-2026-67293 FreeRDP CVE debrief

Who should care

System administrators and security teams responsible for managing RDP connections and FreeRDP implementations should assess their exposure and apply the necessary patches or updates to prevent potential unauthorized access.

Why it matters

CVE-2026-67293 is a critical vulnerability in FreeRDP that could allow attackers to bypass TLS server authentication. System administrators and security teams should assess their exposure, verify their FreeRDP implementation, and apply patches or updates as necessary.

• Potential bypass of TLS server authentication under wildcard-certificate conditions
• Possible unauthorized access to RDP connections
• Need for verification of FreeRDP version and TLS certificate hostname validation
• Priority for updating FreeRDP to version 3.29.0 or later

Technical summary

The FreeRDP library, used for RDP connections, has a vulnerability in its TLS hostname matcher. The tls_match_hostname() function incorrectly handles wildcard certificates, allowing a certificate for *.example.com to be used for a.b.example.com, which could lead to authentication bypass. This vulnerability affects FreeRDP versions less than or equal to 3.28.0 and is fixed in version 3.29.0 or later. System administrators and security teams should assess their exposure and apply patches or updates as necessary to prevent potential unauthorized access.

Defensive priority

High

Recommended defensive actions

• Review and apply the patch for FreeRDP version 3.29.0 or later
• Update FreeRDP to version 3.29.0 or later
• Verify the TLS certificate hostname validation in your FreeRDP implementation
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. Vendor advisory and patch information are available. The vulnerability affects FreeRDP versions less than or equal to 3.28.0. The TLS hostname matcher incorrectly handles wildcard certificates, allowing a certificate for *.example.com to be used for a.b.example.com. This could lead to authentication bypass. System administrators and security teams should verify their FreeRDP version and TLS certificate, and

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.