CVE-2026-124865 is a use-after-free vulnerability in the Audio/Video component of Firefox. This flaw was addressed and fixed in Firefox 160 and Firefox ESR versions 115.45 and 153.7. The vulnerability has a high severity rating with a CVSS score of 8.8, indicating it can lead to significant impact including confidentiality, integrity, and availability compromises. No known exploits in the wild have been reported. The vendor has released official patches resolving this issue.