Is CVE-2026-84120 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-84120?

CVE-2026-84120 has a CVSS v3 severity of MEDIUM (5.4).

Back

CVE-2026-84120

Description

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.