CVE-2026-6754

Use-after-free in the JavaScript Engine component

High · published April 21, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
46.9
In the wild
Unconfirmed
What it is

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00579 · 46.9th percentile
Published
2026-04-21T12:40Z
EPSS history
Timeline
  • 21 APR 12:40Z
    Use-after-free in the JavaScript Engine component
    cvelistv5