CVE-2026-124952 is a use-after-free vulnerability in the Audio/Video component of Firefox ESR. This flaw was addressed and fixed in Firefox ESR version 115.45. The vulnerability has a high severity rating with a CVSS score of 8.8, indicating it can lead to high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported. Users are advised to update to the fixed version to mitigate the risk.