CVE-2026-16392CWE-670CWE-843

CVE-2026-16392

Critical · published July 21, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
28.8
In the wild
Unconfirmed
What it is

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00362 · 28.8th percentile
Weaknesses
CWE-670 · Always-Incorrect Control Flow Implementation; CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')
Published
2026-07-21T17:17Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 153.0.0153.0.0
mozilla/thunderbird< 153.0153.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=2044606 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-68/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-71/ · [email protected]
EPSS history
Timeline
  • 21 JUL 12:38Z
    JIT miscompilation in the JavaScript Engine: JIT component
    cvelistv5