CVE-2026-6783 describes a vulnerability in Mozilla Firefox's Audio/Video Playback component caused by incorrect boundary conditions leading to an integer overflow. This flaw could result in integrity violations within the affected component. The issue was addressed and fixed in Firefox version 150. The vulnerability has a CVSS 3.1 base score of 5.3 (medium severity) with an attack vector of network, low attack complexity, no privileges required, and no user interaction needed. No exploits have been reported in the wild. The vendor advisory from Mozilla confirms the fix is included in Firefox 150.

The vulnerability impacts the integrity of the Audio/Video Playback component in Firefox. There is no reported impact on confidentiality or availability. No known exploits exist in the wild, reducing immediate risk. Successful exploitation could potentially allow an attacker to cause unintended behavior or data corruption within the playback functionality.

Mozilla has released an official fix for this vulnerability in Firefox 150. Users and administrators should update to Firefox 150 or later to remediate this issue. No additional mitigation actions are required beyond applying the official update.