Medium [CVE-2026-67293] Weakens TLS server authentication due to improper wildcard certificate hostname validation
This medium-severity Red Hat Linux advisory covers CVE-2026-67293 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
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. A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol (RDP).
The software's Transport Layer Security (TLS) hostname matcher incorrectly validates wildcard certificates, allowing it to accept certificates for multi-label subdomains that should not be covered. This vulnerability could enable a remote attacker to impersonate a legitimate server, potentially compromising the authenticity of the connection.
This weakens the overall security of TLS server authentication. This could allow a malicious RDP server to impersonate a legitimate server if a client attempts to connect to a subdomain covered by an improperly validated wildcard certificate.
Red Hat severity: Moderate — CVSS 4.2 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N). Weakness: CWE-295.
- < 3.29.0
- < 3.28.0
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
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