CVE-2026-2757 is a security vulnerability identified in the WebRTC Audio/Video component of Mozilla Firefox. The root cause is incorrect boundary condition handling, which typically means that the software does not properly check the limits of data buffers or arrays during audio/video processing in WebRTC sessions. This can lead to memory corruption, buffer overflows, or other undefined behaviors that attackers might exploit to execute arbitrary code, cause denial of service, or bypass security controls. The affected Firefox versions include all releases prior to version 148, as well as Firefox ESR versions below 115.33 and 140.8. WebRTC is widely used for real-time communications such as video conferencing and voice calls directly in the browser without plugins, making this vulnerability particularly sensitive. Although no active exploits have been reported, the flaw's presence in a critical media processing component suggests a significant attack surface. The lack of a CVSS score indicates the vulnerability is newly disclosed and pending detailed impact analysis. Mozilla has reserved the CVE and published the advisory, signaling that patches are expected or underway. The vulnerability requires no user authentication but may require user interaction to initiate a WebRTC session. Attackers could craft malicious WebRTC streams or web pages to trigger the flaw. This vulnerability underscores the importance of secure media handling in browsers and the risks posed by complex real-time communication protocols.

The potential impact of CVE-2026-2757 is substantial for organizations and users relying on Firefox for WebRTC-based communications. Exploitation could lead to arbitrary code execution within the browser context, enabling attackers to compromise user data confidentiality and integrity. It could also cause browser crashes or denial of service, disrupting critical communication services. Organizations using Firefox in enterprise environments, especially those conducting sensitive voice or video calls, face risks of espionage, data leakage, or operational disruption. Since WebRTC is integrated into many web applications, the attack surface is broad, affecting both desktop and potentially mobile Firefox users. The vulnerability could be leveraged in targeted attacks against high-value individuals or organizations, including government, financial, and healthcare sectors. The absence of known exploits suggests limited immediate risk, but the availability of a public CVE means attackers may develop exploits soon. Failure to patch promptly could result in widespread compromise, especially in regions with high Firefox adoption or where WebRTC is heavily used for remote collaboration.

To mitigate CVE-2026-2757, organizations and users should promptly update Firefox to version 148 or later, or Firefox ESR versions 115.33 or 140.8 and above once these patches are released. Until patches are available, administrators can restrict or disable WebRTC functionality via browser policies or extensions to limit exposure. Employ network-level controls to monitor and filter suspicious WebRTC traffic, especially from untrusted sources. Educate users to avoid accessing untrusted websites that may host malicious WebRTC content. Implement endpoint security solutions capable of detecting anomalous browser behavior or memory corruption attempts. For enterprise environments, consider isolating browsers in sandboxed environments to contain potential exploitation. Regularly review Mozilla security advisories for updates and apply patches immediately upon release. Additionally, organizations should audit their use of WebRTC-based applications and assess the necessity of this functionality in sensitive environments to reduce attack surfaces.