CVE-2026-67293

FreeRDP

Published 1 Aug 2026 · updated 29 Sept 2026 · Analyzed

9.3 Critical · CVSS 4.0, vulncheck.com

Description

FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname validation vulnerability. The TLS hostname matcher (tls_match_hostname() in libfreerdp/crypto/tls.c) treats a wildcard pattern such as *.example.com as matching any hostname ending in .example.com, so it incorrectly accepts a wildcard certificate for multi-label subdomains like a.b.example.com (which OpenSSL's X509_check_host() rejects). This weakens TLS server authentication under wildcard-certificate conditions.

References

github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f · Patch
github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5wr6-8m8j-3h7f · Exploit, Vendor Advisory
www.vulncheck.com/advisories/freerdp-before-improper-certificate-hostname-validation · Third Party Advisory