VULNERABILITY INTELLIGENCE

CVE-2026-4702

CVSS score9.8 CRITICAL
EPSS probability0.70%
CISA KEVNot currently listed
Published2026-03-24
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

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

Weakness classification

  • CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

Primary references