CVE-2026-8388

Incorrect boundary conditions in the JavaScript Engine: JIT component

Medium · published May 12, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
39.2
In the wild
Unconfirmed
What it is

Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00464 · 39.2th percentile
Published
2026-05-12T12:36Z
EPSS history
Timeline
  • 12 MAY 12:36Z
    Incorrect boundary conditions in the JavaScript Engine: JIT component
    cvelistv5