CVE-2026-4749 is a vulnerability identified in the miraclecast project, an open-source implementation that enables wireless display and casting capabilities on Linux-based systems. The vulnerability affects all versions before v1.0 and is characterized by a CVSS 3.1 base score of 6.5, indicating medium severity. The attack vector is adjacent network (AV:A), meaning exploitation requires network proximity, such as being on the same local network segment. The attack complexity is low (AC:L), no privileges are required (PR:N), and no user interaction is necessary (UI:N). The scope is unchanged (S:U), and the impact is high on confidentiality (C:H), with no impact on integrity (I:N) or availability (A:N). This suggests that an attacker can remotely access sensitive information or data handled by miraclecast without altering or disrupting system operations. The vulnerability details are sparse, with no CWE classification or technical specifics provided, and no patches or known exploits currently available. Miraclecast is commonly used in Linux environments to facilitate wireless display connections, making this vulnerability relevant for systems that expose miraclecast services on local networks. The lack of authentication and user interaction requirements increases the risk of unauthorized data disclosure if the service is accessible. The vulnerability was published on March 24, 2026, by GovTech CSG, indicating an official recognition and tracking by security authorities.

The primary impact of CVE-2026-4749 is unauthorized disclosure of sensitive information due to the high confidentiality impact. Organizations using miraclecast in environments where the service is accessible over adjacent networks are at risk of data leakage. Since the vulnerability does not affect integrity or availability, it does not enable attackers to modify data or disrupt services directly. However, the ability to access confidential data without authentication can lead to secondary impacts such as information theft, privacy violations, and potential reconnaissance for further attacks. The medium severity rating reflects the balance between the high confidentiality impact and the requirement for network proximity, which limits remote exploitation. Industries relying on wireless display technologies for presentations, collaboration, or digital signage, especially in sensitive environments like government, healthcare, or finance, could face significant risks if miraclecast is deployed without proper network controls. The absence of known exploits reduces immediate threat but does not eliminate the risk, especially once exploit code becomes available. The lack of patches means organizations must rely on mitigation strategies until an official fix is released.

1. Network Segmentation: Restrict miraclecast service access to trusted and isolated network segments to prevent unauthorized adjacent network access. 2. Access Controls: Implement firewall rules or network ACLs to limit connectivity to miraclecast ports only to authorized devices and users. 3. Service Hardening: Disable miraclecast if not required or restrict its usage to minimal necessary systems. 4. Monitoring and Logging: Enable detailed logging of miraclecast activity and monitor for unusual access patterns or unauthorized connections. 5. Update Management: Regularly check for official patches or updates from the miraclecast project and apply them promptly once available. 6. Use VPN or Secure Tunnels: If remote access to miraclecast is necessary, enforce secure VPN connections to reduce exposure on adjacent networks. 7. User Awareness: Educate users and administrators about the risks of exposing miraclecast services on untrusted networks. 8. Incident Response Preparation: Develop response plans for potential data disclosure incidents related to this vulnerability. These measures go beyond generic advice by focusing on network-level controls, service-specific restrictions, and proactive monitoring tailored to the nature of the vulnerability and the product involved.