CVE-2026-12299

JIT miscompilation in the DOM: Core & HTML component

Medium · published June 16, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
22.1
In the wild
Unconfirmed
What it is

JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00306 · 22.1th percentile
Published
2026-06-16T11:52Z
EPSS history
Timeline
  • 16 JUN 11:52Z
    JIT miscompilation in the DOM: Core & HTML component
    cvelistv5