CVE-2026-4698

JIT miscompilation in the JavaScript Engine: JIT component

High · published March 24, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
55.6
In the wild
Unconfirmed
What it is

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00785 · 55.6th percentile
Published
2026-03-24T12:30Z
EPSS history
Timeline
  • 24 MAR 12:30Z
    JIT miscompilation in the JavaScript Engine: JIT component
    cvelistv5