FreeRDP up to 3.28.0 TLS Hostname Matcher libfreerdp/crypto/tls.c tls_match_hostname certificate validation

Summaryinfo

A vulnerability was found in FreeRDP up to 3.28.0 and classified as problematic. Affected by this vulnerability is the function tls_match_hostname of the file libfreerdp/crypto/tls.c of the component TLS Hostname Matcher. The manipulation results in certificate validation. This vulnerability is reported as CVE-2026-67293. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in FreeRDP up to 3.28.0. It has been classified as problematic. Affected is the function tls_match_hostname of the file libfreerdp/crypto/tls.c of the component TLS Hostname Matcher. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-67293 since 07/29/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1587.003 by the MITRE ATT&CK project.

Upgrading to version 3.29.0 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Remote Access Software

Name

• FreeRDP

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23
• 3.24
• 3.25
• 3.26
• 3.27
• 3.28.0

License

• open-source

Website

• Product: https://github.com/FreeRDP/FreeRDP/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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