CVE-2026-4724

Undefined behavior in the Audio/Video component

Critical · published March 24, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
37.7
In the wild
Unconfirmed
What it is

Undefined behavior in the Audio/Video component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00445 · 37.7th percentile
Published
2026-03-24T12:30Z
EPSS history
Timeline
  • 24 MAR 12:30Z
    Undefined behavior in the Audio/Video component
    cvelistv5