Improper validation of certificate with host mismatch in FreeRDP - CVE-2026-67288

Vulnerability identifier: #VU137824

CSH Severity: Medium

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-67288

CWE-ID: CWE-297

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass tls server hostname validation.

The vulnerability exists due to improper certificate hostname validation in tls_match_hostname() when verifying wildcard tls certificates for multi-label hostnames. A remote attacker can present a crafted wildcard certificate to bypass tls server hostname validation.

This issue affects cases where a certificate for a single-label wildcard domain is incorrectly accepted for a hostname with multiple labels.

FreeRDP
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
freerdp (Red Hat package)

Install security update from vendor's website.

FreeRDP - update to 3.29.0
freerdp (Red Hat package) - addressed in versions 2.2.0-7.el8_6.12, 2.2.0-12.el8_8.11, 2.2.0-14.el8_4.3, 2.11.7-7.el9_8.6, 2.11.7-12.el8_10

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5wr6-8m8j-3h7f

• Multiple vulnerabilities in FreeRDP
• Red Hat Enterprise Linux 9 update for freerdp
• Red Hat Enterprise Linux 8 update for freerdp
• Red Hat Enterprise Linux 8 update for freerdp
• Red Hat Enterprise Linux 8 update for freerdp
• Red Hat Enterprise Linux 8 update for freerdp