Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox ESR 140.10.1.

A sandbox escape vulnerability exists in Firefox's WebRTC Networking component due to incorrect boundary conditions. This security flaw allows attackers to break out of Firefox's security sandbox, potentially leading to system compromise. The vulnerability affects Firefox ESR versions prior to 140.10.1. Mozilla has addressed this issue in Firefox ESR 140.10.1. The vulnerability has been assigned CVE-2026-7321 and is considered high severity due to its sandbox escape capabilities.