CVE-2026-124860 is a use-after-free vulnerability in the Audio/Video component of Firefox. This flaw was addressed and fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7. The vulnerability has a high severity rating with a CVSS score of 8.8, indicating it can lead to significant impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported. Users should update to the fixed versions to mitigate the risk.